_EC 4.2.1.0 ????? 0 PDB entries  
EC 4.-.-.- Lyases. [3,920 PDB entries]
EC 4.2.-.- Carbon-oxygen lyases. [1,952 PDB entries]
EC 4.2.1.- Hydro-lyases. [1,541 PDB entries]    
EC 4.2.1.0 ????? [-]

[-] signifies that there are no PDB entries for the given enzyme subclass