And by determining the protein composition, the scientists can then extrapolate info about the DNA.

通过确定蛋白质的组成，科学家可以推断出DNA的信息。

It is that variability of protein composition which permits the division of labour and specialisation of function that have allowed complex multicellular organisms such as human beings to evolve.

正是蛋白质组成的可变性允许劳动分工和功能专门化，使复杂的多细胞生物（如人类）得以进化。