Genetics 169 Microbiology 169 Biochemistry 144 Biology 65 metabolism 53 Cytology 48 Ecology 48 Metabolism 47 genetics 47 Virus research 44 Chromosomes 41 enzymes 41 Enzymes 34 Viruses 31 viruses 29 Cell division 27 Bacteria 26 Heredity 26 Molecular biology 26 Mutation 26 Photosynthesis 23 Alkaloids 21 biochemistry 21 Cytogenetics 20 Hormone Research 20 Morphology 20 Protein Chemistry 19 cytogenetics 19 Cell Division 18 Lipids 18