Systemic Lupus Erythematosus 2, also known as systemic lupus erythematosus, susceptibility to, 2, is related to systemic lupus erythematosus and systemic lupus erythematosus 1. An important gene associated with Systemic Lupus Erythematosus 2 is PDCD1 (Programmed Cell Death 1). Affiliated tissues include bone marrow and bone.