(Reuters)—The U.S. Food and Drug Administration on Tuesday approved Inflectra, a cheaper version of Johnson & Johnson’s drug Remicade (infliximab), to treat Crohn’s disease, ulcerative colitis, rheumatoid arthritis, psoriasis and arthritis of the spine. Inflectra, also known as infliximab-dyyb, is expected by some analysts to sell for a 25% discount to Remicade, which generated annual…