infliximab: a monoclonal antibody (trade name Remicade) used to treat Crohn's disease and rheumatoid arthritis; administered by infusion; use and dosage must be determined by a physician
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
xylem: the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels