| Keywords | Database Description | Website |
| Maize | Maize genome database | http://www.maizegdb.org/ |
| TIGR Maize Database | http://maize.tigr.org/ | |
| Maize targeted mutagenesis databas | http://mtm.cshl.edu/ | |
| The ECP/GR Maize Database | http://www.mrizp.co.yu/emdb/default.htm | |
| Maize genome database | http://mips.gsf.de/proj/plant/jsf/maize/index.jsp | |
| MGED | Microarray Gene Expression Data - MGED | http://www.mged.org/ |
| Micro | Micro-Mar Database (Dynamic Representation of Marine Microbial Biodiversity) | http://egg.umh.es/micromar/ |
| Microarray | CEBS: Database of toxicogenomics, microarray and proteomics data | http://cebs.niehs.nih.gov/ |
| Machine Learning | Benchmark-Protein classification benchmark collection: training/test sets for machine learning | http://net.icgeb.org/benchmark/ |
| Maize | Cereal Small RNA Database: Small RNAs expressed in rice and maize | http://sundarlab.ucdavis.edu/smrnas/ |
| Mammal | Argonaute-Gene regulation by mammalian microRNAs | http://argonaute.uni-hd.de/ |
| CORUM: Experimentally verified mammalian protein complexes | http://mips.gsf.de/genre/proj/corum | |
| Mathematical Modeling | BioModels: Mathematical models of biochemical and cellular systems | http://www.ebi.ac.uk/biomodels/ |
| Maturation | Gait Maturation Database and Analysis | http://www.physionet.org/physiobank/database/gait-maturation-db/ |
| Mediator | Mediator Database (Subunits of the RNA polymerase II holoenzyme mediator complex) | http://bio.lundberg.gu.se/medb/ |
| Medical | Medline Plus Database (Health Information) | http://www.nlm.nih.gov/medlineplus/databases.html |
| Brine Tumor Medical Database | http://www.brainlife.org/ | |
| EURO-Medicines database | http://www.euromedicines.org/our_database.html | |
| Medical Subject Headings | http://www.nlm.nih.gov/mesh/MBrowser.html | |
| Mendal | Mendal Database | http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=29857 |
| Mendal and other plant related database | http://www.cbi.pku.edu.cn/mirror/GenomeWeb/plant-gen-db.html | |
| Online Mendelian Inheritance in ManT | http://www.ncbi.nlm.nih.gov/omim/ | |
| Mendelian Inheritance and the Mitochondrion | http://www-lmmb.ncifcrf.gov/mitoDat/ | |
| OMIA - Online Mendelian Inheritance in Animals | http://omia.angis.org.au/acknowledgements.html | |
| Messenger RNA | This database of mRNA sequences and regulatory elements | http://uther.otago.ac.nz/Transterm.html |
| Human au-rich element-containing mrna database | http://rc.kfshrc.edu.sa/ared/ | |
| RNADB (This database is a comprehensive mammalian noncoding RNA database) | http://research.imb.uq.edu.au/rnadb/ | |
| PROMEC - (An updated database of Escherichia coli mRNA promoters with experimentally identified transcriptional start sites) | http://margalit.huji.ac.il/ | |
| Metabolic Pathway | Metabolic Database | http://cgsc.biology.yale.edu/metab.html |
| Metabolic database (Metabolome) | http://metabolic-database.com/ | |
| KEGG (PATHWAY Database) | http://www.genome.jp/kegg/pathway.html | |
| BioSilico is a web-based database system that facilitates the search and analysis of metabolic pathways | http://biosilico.kaist.ac.kr/ | |
| BioCarta (Charting Pathway of Life) | http://www.biocarta.com/genes/ | |
| RAMEDIS, the Rare Metabolic Diseases Database | http://www.ramedis.de/ | |
| PathCase: Metabolic Pathways Database System | http://nashua.case.edu/pathwaysweb/ | |
| MetaCyc is a database of nonredundant, experimentally elucidated metabolic pathways. | http://metacyc.org/ | |
| MPW: the Metabolic Pathways Database | http://citeseer.ist.psu.edu/selkov98mpw.html | |
| Small Metabolic Pathway Database | http://cgsc.biology.yale.edu/metab.html | |
| BioCyc - Pathway/genome databases for many bacteria |
http://biocyc.org/ | |
| Metabolomics | NMR metabolomics database of Linkoping, Sweden (MDL) | http://www.liu.se/hu/mdl/main/ |
| Metabolomics related links | http://dbkgroup.org/metabol.htm | |
| General Metabolomics Sites and Databases | http://www.bmrb.wisc.edu/metabolomics/external_metab_links.html | |
| Nutritional Metabolomics Database | http://www.nugowiki.org/index.php/Nutritional_Metabolomics_Database | |
| Madison Metabolomics Consortium Database | http://mmcd.nmrfam.wisc.edu/ | |
| Metabolomics database | http://lab.bcb.iastate.edu/projects/plantmetabolomics/ | |
| Metadatabase | MetaDB: A Metadatabase for the Biological Sciences | http://www.neurotransmitter.net/metadb/index.php?catid=42 |
| Metalloproteins | COMe - (Co-Ordination of Metals ): Classification of bioinorganic proteins (metalloproteins and some other complex proteins) | http://www.ebi.ac.uk/come/ |
| Microarray | Public Microarray Database and Gene Expression Database | http://ihome.cuhk.edu.hk/~b400559/arraysoft_public.html |
| ArrayExpress-Public collection of microarray gene expression data | http://www.ebi.ac.uk/arrayexpress | |
| Stanford MicroArray Database | http://genome-www5.stanford.edu/ | |
| The Yale Microarray Database | http://www.med.yale.edu/microarray/ | |
| Microarray Databases | http://www.ebi.ac.uk/Databases/microarray.html | |
| UNC MICROARRAY DATABASE | https://genome.unc.edu/ | |
| Yeast Microarray global viewer | http://transcriptome.ens.fr/ymgv/ | |
| Microarray Database - University of Tennessee | http://genome.ws.utk.edu/ | |
| The Yale Microarray Database | http://www.med.yale.edu/microarray/ | |
| GENEVESTIGATOR Microarray database | https://www.genevestigator.ethz.ch/ | |
| Osmotic Stress Microarray Information Database | http://www.osmid.org/ | |
| Microarray Gene Expression Data | http://www.mged.org/ | |
| The Jackson Laboratory (MAD - Microarray Database) | http://mad.jax.org/ | |
| The MicroArray Database | http://www.bioinformatics.nyu.edu/Projects/nyumad/ | |
| Tissue microarray (TMA) | http://www.bioinformatics.leeds.ac.uk/tmadb/ | |
| MOUSE DNA Microarray Database | http://www.kazusa.or.jp/DNA_Microarray/mouse/2003-B6vs129/ | |
| L2L Microarray Analysis Tool (Collection of microarray database) | http://depts.washington.edu/l2l/database.html | |
| Ambystoma Microarray Database | http://www.ambystoma.org/AMDB/ | |
| iCHIP Microarray Database | http://www.dkfz.de/tbi/ngfnServices/dataManagement/index.jsp | |
| Longhorn Array Database | http://www.longhornarraydatabase.org/ | |
| CycleBase: Gene expression profiles from cell-cycle microarray studies | http://www.cyclebase.org/ | |
| Microbial | TIGR (Microbial Database) | http://www.tigr.org/tdb/mdb/mdbcomplete.html |
| VBI (Virgnia Bioinformatics Institute) Microbial Database | http://phytophthora.vbi.vt.edu/ | |
| The Microbial Signal Transduction database (MSTD) contains the signal transduction proteins for 486 complete bacterial and archaeal organisms | http://genomics.ornl.gov/mist/ | |
| Monsanto Microbial Sequence Database (Aspergillus nidulans and Myxococcus xanthus genome sequence data) | http://microbial.cereon.com/ | |
| The YNP Microbial Database and Map Server Prototype | http://gis.inel.gov/ynp/ynpmap.htm | |
| MBGD: Microbial Genome Database | http://mbgd.genome.ad.jp/ | |
| MannDB - A microbial database of automated protein sequence analyses and evidence integration for protein characterization | http://greengenes.llnl.gov/kpath/html/annotation_home_menuFrame.html | |
| Proteome Database System for Microbial Research | http://www.mpiib-berlin.mpg.de/2D-PAGE/ | |
| National Microbial Pathogen Data Resource | http://www.nmpdr.org/ | |
| Marine Microbial Database | http://hbmmd.hboi.edu/ | |
| Microbial Genome Databases | http://microbialgenomics.energy.gov/databases.shtml | |
| MadBase (Microbial Advanced Database organization) Micado | http://locus.jouy.inra.fr/cgi-bin/genmic/madbase/progs/madbase.operl | |
| Microbial Database (A-Z Listing) | http://www.microbialid.com/pages/database.html | |
| MGCUD (Microbial Genome Codon Usage Database) | http://bioinformatics.forsyth.org/mgcud/ | |
| COG - Clusters of Orthologous Groups of proteins Protein families from complete microbial genomes | http://www.ncbi.nlm.nih.gov/COG | |
| Microsatellite | Small Genomes Microsatellite Database | http://www.genomics.ceh.ac.uk/cgi-bin/sgmd/index.cgi |
| Microsatellite Database | http://www.microsatellites.org/db_search.php | |
| MICAS (Microsatellite analysis server) is an Interactive user-friendly web-based server to find non-redundant microsatellites in a given nucleotide sequence/genome sequence. | http://210.212.212.7/MIC/index.html | |
| SilkSatDb (Silkworm Microsatellite database) | http://210.212.212.7:9999/PHP/SILKSAT/index.php | |
| Mouse Microsatellite Data Base of Japan (MMDBJ) | http://www.shigen.nig.ac.jp/mouse/mmdbj/top.jsp | |
| The Cotton Microsatellite Databas | http://www.mainlab.clemson.edu/cmd/ | |
| Microsatellites Repeats Database (MRD) | http://www.ccmb.res.in/mrd/ | |
| Minisatellite | Swiss Vitis Microsatellite Database | http://www.unine.ch/nccr/svmd/ |
| Missense | Xiphophorus Microsatellite Loci Database | http://www.xiphophorus.org/microsats/microsat.htm |
| Mitochondrial | InSatDb,( Insects Microsatellite Databases) | http://210.212.212.8/PHP/INSATDB/home.php |
| The Nuclear Microsatellite Database contains nuclear microsatellite profiles of Greek cultivars and of foreign cultivars. | http://gvd.biology.uoc.gr/gvd/contents/05.htm | |
| Microsatellite Repeats database | http://insilico.ehu.es/microsatellites/info.html | |
| Minisatellite database | http://minisatellites.u-psud.fr/GPMS/ | |
| MMR Gene Missense Mutation Database | http://www.mmrmissense.org/mmrmissense.aspx | |
| A human mitochondrial genome database | http://www.mitomap.org/ | |
| mtDB - Human Mitochondrial Genome Database | http://www.genpat.uu.se/mtDB/ | |
| Mitochondrial Protein Database | http://bioinfo.nist.gov/hmpd/index.html | |
| The Human Mitochondrial Database (HmtDB!) | http://www.hmdb.uniba.it/ | |
| Mitochondrial Database | http://www.smgf.org/pages/mtdatabase.jspx | |
| MitoProteome is an object-relational mitochondrial protein sequence database generated from experimental evidence and public databases, and containing both mitochondrial- and nuclear-encoded entries | http://www.mitoproteome.org/ | |
| Mitochondrial Proteome (Database for mitochondria-related genes, proteins and diseases) | http://www.mitop.de:8080/mitop2/ | |
| Yeast Deletion Project and Proteomics of Mitochondria Database | http://www-deletion.stanford.edu/YDPM/YDPM_index.html | |
| Yeast Mitochondrial Protein Database | http://bmerc-www.bu.edu/projects/mito/ | |
| MamMiBase (Mammalian Mitochondrial Genomics Database) |