ELISA kits for the study of the target, B7-H4 are available in ready-to-use formats. The protein is also known as V-set domain containing T cell activation inhibitor 1 or VTCN1. It is a 282-residue protein with a membrane localization. In addition, up to 4 isoforms have been discovered. Other alias names for this target include: B7H4, B7-H4, T cell costimulatory molecule B7x, B7 superfamily member 1, B7 homolog 4, and B7 family member H4, and B7X.