Number of ligand-binding sites, other sites, and other sites within domains, and the fraction of these that are conserved.

Data for ligand-binding sites are given both when considering all types of ligands together as well as when split up by type of ligand. Note that some sites may participate in interactions with more than one ligand type.

配体结合位点（ligand-binding sites）的相关数据，既涵盖了将所有类型配体合并分析的情况，也涵盖了按配体类型分别拆分统计的场景。需注意，部分结合位点可能会与多种配体类型发生相互作用。