指的是这样一些基因，它们起源于这些基因所在物种的最近的共同祖先的一条基因。
Orthology describes genes in different species that derive from a single ancestral gene in the last common ancestor of the respective species.
所有细胞生物最近的共同祖先如何生活？
Our last common ancestor inhaled hydrogen from underwater volcanoes.
所有细胞生物最近的共同祖先如何生活？
Our last common ancestor inhaled hydrogen from underwater volcanoes.
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