macroevolution - macromolecular system - macromolecule - macrophage colony-stimulating factor - major histocompatibility complex - Malpighi body - Malpighi layer - marine biology - maslinic acid - mass spectrometer - maturation-promoting factor - mechanoreceptor - medicine - meiosis - melting point - membrane glycoprotein - membrane protein - membrane topology - membrane transport - memory B cell - memory T cell - Mendelian inheritance - metabolic pathway - metabolism - metabotropic glutamate receptor - metalloprotein - metaphase - metazoa - methionine - micelle - Michaelis-Menten kinetics - microbe - microbiology - microevolution - microfilament - microfilament protein - microsatellite - microscope - microtiter plate - microtubule-associated protein - mineralocorticoid receptor - minisatellite - mitochondrial membrane - mitochondrion - mitogen receptor - mitosis - mitotic spindle - mixture - modern evolutionary synthesis - molar volume - mole (unit) - molecular biology - molecular chaperone - molecular dynamics - molecular engineering - molecular evolution - molecular mechanics - molecular modelling - molecular orbital - molecular phylogeny - molecular sequence data - molecule - monoamine - monoclonal antibody - monomer - monosaccharide - monosaccharide transport protein - morphogenesis - morphogenetic field - mos gene - Mössbauer spectroscopy - MRI - MSH - mu opioid receptor - mu-chain immunoglobulin - mucin - Muller's ratchet - multiresistance - muscarinic receptor - muscle - muscle protein - mutagen - mutation - myc gene - mycology - myelin basic protein - myeloma protein - myosin