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4.240
4.280
42.13 molecular biology
42.00 biology: general
42.75 insects
42.40 botany: general
42.60 zoology: general
42.30 microbiology
42.11 biomathematics
42.66 ethology
42.63 animal physiology
42.03 methods and techniques of biology
42.21 evolution
42.03 methods and techniques of biology
42.04 teaching, profession and organizations of biology
42.85 physical anthropology
42.15 cytology, cell biology and cell physiology
42.43 plant genetics
42.90 ecology: general
42.05 natural history