oxytocin (cuddle hormone) molecule

peptide protein biotech biotechnology biochemistry structure molecule chemical chemistry atoms atomic oxytocin love cuddle cuddling hormone neuro neuromodulator sexual reproduction behavior cervix uterus breast milk breastfeeding pair bonding anxiety birth vasopressin pdb1npo lactation lactating contraction suckling orgasm arousal mother maternal attachment romance romantic nonapeptide spray serotonin male female man woman