_EC 3.4.18.- Cysteine-type carboxypeptidases. 2 PDB entries  
EC 3.-.-.- Hydrolases. [22,079 PDB entries]
EC 3.4.-.- Acting on peptide bonds (peptide hydrolases). [7,224 PDB entries]
EC 3.4.18.- Cysteine-type carboxypeptidases. [2 PDB entries]    
EC 3.4.18.1 Cathepsin X. [2 PDB entries]