Larger Image Fig. 2. Exocrine gene expression in isolated whole guts. (A–C) Amylase expression. Expression of amylase is first detected in the ventral pancreas at stage 41. By stage 45, however, expression has spread throughout both the dorsal and ventral pancreas. (D–F) Elastase expression. As seen with amylase, elastase is first detected in the ventral pancreas and thereafter throughout the whole pancreas. (G–I) Trypsinogen expression. The time course of trypsinogen expression is identical to amylase. (A,D,G) Stages 40–41. (B,E,H) Stages 42–44. (C,F,I) Stages 45–46. Image published in: Horb ME and Slack JM (2002) Copyright © 2002. Image reproduced with permission of the Publisher, Elsevier B. V. Gene Synonyms Species Stage(s) Tissue cela1.S cela1.1, ela1, MGC85508 X. laevis Sometime during NF stage 40 to NF stage 41 ventral pancreatic bud amy2b.S X. laevis Sometime during NF stage 40 to NF stage 41 ventral pancreatic bud prss1.L trp1, try1, trypsin, trypsinogen X. laevis Sometime during NF stage 40 to NF stage 41 ventral pancreatic bud amy2b.S X. laevis Sometime during NF stage 42 to NF stage 45 pancreas cela1.S cela1.1, ela1, MGC85508 X. laevis Sometime during NF stage 42 to NF stage 45 pancreas prss1.L trp1, try1, trypsin, trypsinogen X. laevis Sometime during NF stage 42 to NF stage 45 pancreas Image source: Published Permanent Image Page Printer Friendly View XB-IMG-45561