Cell Biology-- Cytology 146 Developmental Biology-- Reproduction-- Growth 93 Embryology 64 Immunology 51 Developmental Biology-- Reproduction-- Growth-- Vertebrate reproductive biology 48 Animal Physiology 45 Biophysics 38 Neuro endocrinology 26 Tissue culture 22 Physiology and related subjects 20 Radiobiology-- Biophysics-- Biology 19 Toxicology 16 Diseases-- Pathology-- Pathobiology 15 Nucleus 15 Aging--biology-- Senescence 14 Fertilization (Biology) 14 Anatomy and morphology 11 Regeneration (Biology) 11 Body temperature-- Thermobiology 9 Tissue biology and regional physiology-- Histology 9 Mitochondria 8 Cell differentiation-- Tissue differentiation-- Histogenesis 6 Membranes 6 cell biology 6 stem cells 6 Lysosomes-- vesicles-- Vacuoles 5 Vectors Biology-- Disease vectors 5 Fetus--Physiology-- Embryo 4 Metamorphosis 4 Sex differentiation 4