ARSI and colonic neoplasm: As a result, the tissues expressing ARSI were, in order from the top, placenta (7 ESTs), retinoic acid-treated embryonic stem cell (6), retinoic acid-treated NT2 embryonic carcinoma cell line (3), colon tumor (3), fetal eyes (3), and lens (3), suggesting that ARSI is preferentially expressed in placenta, embryonic cell, and eye.