_EC 3.6.-.- Acting on acid anhydrides. 9,130 PDB entries  
EC 3.-.-.- Hydrolases. [51,972 PDB entries]
EC 3.6.-.- Acting on acid anhydrides. [9,130 PDB entries]
EC 3.6.1.- In phosphorus-containing anhydrides. [4,117 PDB entries]
EC 3.6.2.- In sulfonyl-containing anhydrides. [9 PDB entries]
EC 3.6.3.- Acting on acid anhydrides; catalyzing transmembrane movement of s [125 PDB entries]
EC 3.6.4.- Acting on ATP; involved in cellular and subcellular movement. [3,252 PDB entries]
EC 3.6.5.- Acting on GTP; involved in cellular and subcellular movement. [1,627 PDB entries]