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Fig. 2. 5-HT2β receptors contain key structural elements typical of
the 5-HT receptor superfamily and are conserved among arthropods. Predicted
protein sequences of 5-HT2β from Panulirus and
Procambarus are aligned with their ortholog from Drosophila
and the human 5-HT2C receptor. Residues identical to the
5-HT2βPro sequence are indicated with thin lined boxes.
Transmembrane domains are indicated with black bars above the sequence and the
reference residue for numbering in each is shaded (see Results). Black ovals
surround amino acids important for 5-HT ligand binding. Grey boxes surround
areas important for G protein coupling or activation. Asterisks above the
sequences indicate consensus sites for N-linked glycosylations in crustacean
sequences. A black dot indicates the evolutionary change from DRY to DRF in
crustacean sequences (see Results).