<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31320316</termId><termName>amino acid</termName><termType>PT</termType><termNote><![CDATA[ One of a class of organic acids marked by both an amine group and a carboxyl acid group. The 25 amino acids are the building blocks of protein and the end result of protein digestion. ]]></termNote><termCreatedDate>2026-03-30 20:26:19</termCreatedDate><relation><relationType>UF</relationType><termId>31320317</termId><termName>acid, amino</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31320318</termId><termName>amino acids</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31306060</termId><termName>acid</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31344304</termId><termName>glycine</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31344309</termId><termName>cysteine</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31344310</termId><termName>cystine</termName><termType>PT</termType></relation></term>  </Zthes>