[Gland formation and pepsinogen expression in the gizzard endoderm as affected by the proventricular mesenchyme in the chick embryo].

Studies of epithelio-mesenchymal recombination between the proventriculus and gizzard of 6-day chick embryos revealed that the proventricular mesenchyme can induce the morphogenesis of complex glands and cause the expression of embryonic pepsinogen in the gizzard endoderm, while the gizzard mesenchyme inhibits both of them.