This category contains details for the cloning steps used in the overall protein production process. Each row in PDBX_ENTITY_SRC_GEN_CLONE should have an equivalent row in either PDBX_ENTITY_SRC_GEN_CLONE_LIGATION or PDBX_ENTITY_SRC_GEN_CLONE_RECOMBINATION. If only summary information is provided data in the later two categories may be omitted.