Biochemistry 35 MUTATION 22 Organic Chemistry 19 Plant physiology 17 Mathematics 13 Molecular biology 13 Cytology 12 Ecology 12 Genetics 12 MUTATION RESEARCH: INTERNATIONAL JOURNAL OF MUTAGENESIS CHROMOSOME BREAKAGE AND RELATED SUBJECTS 12 Chemistry, Organic 11 Microbiology 11 Organic chemistry 10 Chemistry 9 Parasitology 9 Physiology 9 Brenners Encyclopedia of Genetics. 2nd Ed 7 Chemistry, Inorganic 7 Geology 7 Molecular Biology 7 Oceanography 7 Organic compounds 7 Biology 6 Biotechnology 6 Cell biology 6 Chromatography 6 Climatology 6 GENE 6 Plant tissue culture 6 Botany 5