Please note that this article was originally printed in Gut and the correct citation for this article is:

Sonic hedgehog expression correlates with fundic gland differentiation in the adult gastrointestinal tract
G R van den Brink, J C H Hardwick, C Nielsen, C Xu, F J ten Kate, J Glickman, S J H van Deventer, D J Roberts, and M P Peppelenbosch
Gut 2002; 51: 628-633.

The publishers apologise for any confusion that this might cause.