 As a result of these roles, the IL-17 family has been linked to many immune/autoimmune related diseases including rheumatoid arthritis, asthma, lupus, allograft rejection, anti-tumour immunity and recently psoriasis, multiple sclerosis., and intracerebral hemorrhage.The gene for human IL-17 is 1874 base pairs long and was cloned from CD4+ T cells.Each member of the IL-17 family has a distinct pattern of cellular expression.