abstract icon with dopamine formula. dopamine formula

dopamine endorphin neurotransmitter serotonin icon melatonin estrogen chemical testosterone taurine molecule hormones cortisol brain abstract line formula adrenaline chemistry biology flat euphoria structure biochemistry cartoon periodic model hormone laboratory compound health progesterone happy neuromodulator noradrenaline neuro atomic leptin medicine isolated peptide acid aminobutyric graphic background glutamate molecular thyroxine neuron passion