This category contains details for the ligation-based cloning steps used in the overall protein production process. _pdbx_entity_src_gen_clone_ligation.clone_step_id in this category must point at a defined _pdbx_entity_src_gen_clone.step_id. The details in PDBX_ENTITY_SRC_GEN_CLONE_LIGATION extend the details in PDBX_ENTITY_SRC_GEN_CLONE to cover ligation dependent cloning steps.