guest residue如何翻译？
小白求助
全句：
elastin-like polypeptides (elps) are a class of synthetic polypeptides comprised of multiple repeats of the amino acid sequence (v-p-g-x-g)n,
where v, p, and g are valine, proline, and glycine, respectively, and n is the number of pentamer repeat units along the polypeptide chain. the fourth residue, x, in this pentad is often termed the “guest residue” which can be any amino acid except proline.
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全句是怎么说的
Elastin-like polypeptides (ELPs) are a class of synthetic polypeptides comprised of multiple repeats of the amino acid sequence (V-P-G-X-G)n, where V, P, and G are valine, proline, and glycine, respectively, and n is the number of pentamer repeat units along the polypeptide chain. The fourth residue, X, in this pentad is often termed the “guest residue” which can be any amino acid except proline
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好吧，这个词在这里翻译为“客体残基”