Anti-PEN antibodies can be readily obtained from commercial sources. The PEN protein is a reported synonym for the human gene TSPAN33, encoding tetraspanin 33. The full-length protein is 31,538 daltons in mass and has been noted to be cytoplasmic and membrane-associated. This protein is reported to contain sites of glycosylation. Visit the antibody supplier page for key details, including validated applications and target specificity.