Volume 39, number 3, (1997), in article no. GE964520 "Two novel human members of an emerging mammalian gene family related to mono-ADP-ribosylating bacterial Toxins," by friedrich koch-nolte, friedrich haag, rickmer braren, maren Kuhl, jan hoovers, sriram balasubramanian, fernando bazan, and heinz-Gunter thiele, pages 370-376: