It seems to vary enough, but not too much, to act as a reliable marker.
这种基因有它的变体，但变体不多，因此可以作为可靠的标记。
Few healthy cells make these enzymes, so they are a reliable marker of tumours.
由于很少有健康的细胞制造这些酶，所以它们是一种可靠的肿瘤标记物。
All animals have it. It seems to vary enough, but not too much, to act as a reliable marker.
所有动物都有这个基因；这种基因有它的变体，但变体不多，因此可以作为可靠的标记。
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