HTN3 ，是一能够指导组氨素3合成的基因 片段[ 3] [ 4] 279 H418 O69 N84 S3 [ 5]
HTN3基因表达的初级产物为组氨素3。组氨素 是一类存在于唾液中的富含组氨酸 的蛋白质 ，控制其合成的基因位点除了HTN3之外，还有H1N1。组氨素3在合成完毕后，还可以通过蛋白水解转化成其它的组氨素（比如组氨素4-6）。能控制组氨素3合成的等位基因为HIS2[ 6]
等位基因
基因
蛋白质
HIS1
HTN1
组氨素 1
HIS2
HTN3
组氨素 3 → 组氨素 4-6
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