Ok, so the first letter (before a number that both become their own thing or follow the gene supergroup) means the hormone that acts on that receptor?

Like D1 and D2 are dopamine, H1 is histamine, HT is fuck-knows, and M1 or M3 or M5 are "muscarinic"?
At least alpha-1 for adrenergic is easier to remember.

"It also acts on dopaminergic D1 and D2 receptors. Quetiapine is an antagonist for D2 receptors and 5-HT2 receptors.[10] "
[...]
"Furthermore, norquetiapine has an affinity for other receptors, such as H1 histamine receptor, 5-HT1E, 5-HT2A, 5-HT2B, 5-HT7 serotonergic receptors, M1, M3, and M5 muscarinic receptors, and α1-adrenergic receptors.[12]"

https://www.mdpi.com/2673-9879/2/3/18

#BioChemistry #química #chem #chemistry #Biology #HumanBiology