Whole-mount in-situ hybridization (ISH) of 3 days post fertilization (dpf) zebrafish larvae probed for add1 (A), add2 (B), add3a (C), add3b (D) and xpnpep1 (E). There is liver staining for add3a (C, black arrow) and xpnpep1 (E, black arrow) but not for the other probes. There is intestinal staining for both add3a, add3b and xpnpep1 (black arrowheads in C, D, E). There is also staining of add2 and add3a in the head region, which is of unclear specificity (B, C). Similar experiments were performed using a riboprobe directed against xpnpep2, but there was no staining in 3 dpf larvae (not shown).