title: Ig isotypes deficiency caused by gene deletions.
mesh_terms: D002872:Chromosome Deletion; D004406:Dysgammaglobulinemia / Q000235:genetics*; D005796:Genes; D006801:Humans; D007127:Immunoglobulin Constant Regions / Q000235:genetics; D007132:Immunoglobulin Isotypes / Q000145:classification / Q000235:genetics*
chemical_list: D007127:Immunoglobulin Constant Regions; D007132:Immunoglobulin Isotypes