The worldwide pdb (wwpdb) organization manages the pdb archive and ensures that the pdb is freely and publicly available to the global community. Asymmetric unit：不对称单元； biological assembly：生物学集合体，在这个语境可以翻译成聚体。 不对称单元（asymmetric unit）是晶体学中的一个概念。定义是：在空间群的对称操作作.
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