| http://www.w3.org/ns/prov#value | - amino acid such as histidine, lysine, arginine, 2,3-diaminopropionic acid, ornithine, homoarginine, ??-amino-phenylalanine, and 2,4-diaminobutyric acid; Xaa10 is a polar, acidic, basic or apolar amino acid, for example, a polar amino acid such as asparagine, glutamine, serine, threonine, tyrosine, citrulline, N-acetyl lysine, methionine sulfoxide, or homoserine, an acidic amino acid such as aspart
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