Serotonin neurotransmitter molecule Molecular model Coronary artery disease Detached blood clot, artwork Toothache, conceptual artwork DNA replication, artwork Bacterial lung infection Virus particles entering cells, artwork Virus particles, artwork Nerve damage and stem cells, artwork Fertilisation, artwork Dendritic cells, artwork Viral throat infection, artwork Action of serotonin reuptake inhibitors Human skull Synapses, artwork Cells Blood cells in blood vessel, artwork Retina in glaucoma, artwork Rod-shaped bacteria, artwork