Assertion: tryptophan | /r/CreatedBy | conserved tryptophan
Facets:
Source sentences:
text: The first tryptophan in the peptide corresponds to a conserved tryptophan at the end of β-strand 18 in the crystal structure (38), suggesting that, in this particular V4 loop, the β-strand is extended slightly, with the trpzip sequence forming a β-hairpin.