That makes the tiger and snow leopard "sister species", the researchers report in the journal Molecular Phylogenetics and Evolution.

“这使老虎和雪豹成为了‘姐妹种’”，研究者在《分子系统学和进化》一刊中这样说。

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In a few very simple species, that appears to be the case, and molecular biologists are exploring ways to parlay that knowledge into something that could benefit humans.

这种现象出现在一些单纯种中。分子生物学家正在探索一种方法，能够把知识集中到某些能够有益于人类的事物上。

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In the 1980s molecular and genetic analysis was introduced, enabling species to be identified by their DNA rather than visual observation.

1980年分子学和基因分析的出现，可以通过物种的DNA而不是通常的观察来鉴别他们。

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The team studied the "molecular clocks" of living species of fungi, plants and animals.

BBC: Earth AP

You would, therefore, have expected that macroscopic differences between species are reflected in differences between the molecular structure of these proteins, but this is not so.

ECONOMIST: Genetic science