Related by context. Frequent words. (Click for all words.) 57 asexual reproduction 56 monogamous 54 hormone oxytocin 54 vasopressin 54 nonhuman primates 53 Oxytocin 52 Toxoplasma 52 Wolbachia 52 reproductive hormones 52 mutant mice 52 simian immunodeficiency virus 52 neuronal cells 52 humans 51 oxytocin 51 C. elegans 50 multicellular organisms 50 sirtuin 50 pheromones 50 Caenorhabditis elegans 50 sociality 49 PrP 49 corticosterone 49 herpes viruses 48 mice 48 neuropeptide 48 monogamous relationships 48 mutant gene 48 prokaryotes 48 fruit fly Drosophila 48 chimeras 48 Fruit flies 48 hermaphrodites 48 crocodilians 48 overexpress 48 naked mole rats 48 rhesus macaques 48 steroid hormones 48 germ cells 47 single celled organisms 47 homologous 47 mouse embryos 47 synaptic plasticity 47 Mammalian 47 interspecies 47 evolutionarily 47 astrocytes 47 mammalian 47 hormone estrogen 47 hermaphroditic 47 dopamine receptors 47 TGF beta 47 subfamily 47 genetically altered mice 47 myoblasts 46 asexual 46 Chimpanzees 46 roundworms 46 serotonergic 46 astrocyte 46 zebra fish 46 Drosophila melanogaster 46 retinoic acid 46 Wnt 46 neuroendocrine 46 primates 46 forelimbs 46 antimicrobial peptides 46 genetically modified mice 46 eukaryotes 46 heritable 46 bonobo 46 Ghrelin 46 cAMP 46 Candida albicans 46 osteocalcin 46 female hormone estrogen 46 neurones 46 brain derived neurotrophic 45 prolactin 45 vertebrate 45 single celled 45 genetically 45 Wnt signaling 45 germline 45 mammalian species 45 glucocorticoids 45 mammals 45 vaginal secretions 45 estrogen receptors 45 Zebrafish 45 Males 45 bonobos 45 alpha synuclein 45 Humans 45 deficient mice 45 protozoan 45 carbon atom 45 prion proteins 45 Prions 45 cultured cells 45 diploid