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We have used immunochemical, chromatographic, and bioassay techniques to characterize peptides related to gastrin and CCK, from the stomach of the reptile Crocodylus niloticus. By immunocytochemistry gastrin/CCK-like peptides were localized in specific mucosal cells of the pylorus and in the duodenum. Boiling water extracts of pyloric antrum cross reacted(More)
Serotonin-immunoreactive, i.e. enterochromaffin (EC) cells were found to be widely distributed in the intestine of the newly hatched chick but sparse in the stomach, and being particularly abundant in the duodenum, upper ileum and rectum. Although in birds, as in mammals, EC cells are most abundant in the intestine, in the stomach they are far sparser than(More)
The proventriculus, gizzard and pyloric antrum (region between the gizzard and the duodenum) of 18-day Black Australorp chick embryos and of chicks within 30 h of hatching have been studied by electron microscopy. D and EC cells, and putative G, D1 and A-like cells were identified (terminology of Solcia et al., 1973) but no ECL cells. No endocrine cells of(More)
Lead isotope data from quartz-gold vein deposits and volcanogenic and r e l a t e d d e p o s i t s i n the I n s u l a r Belt group f a l l i n f o u r d i s t i n c t c l u s t e r s h o s t rock category. (1) Sicker-hosted volcanogenic deposits to paramagmatic deposits to Karmutsen and Bonanza-hosted veins. The t r e n d s Sicker-hosted veins, and (2)(More)
The duodenum of 16-day Black Australorp chick embryos, and the duodenum, ileum, large intestine and caeca of 18-day embryos and of chicks within 30 h of hatching, have been studied by electron microscopy. Cells were found with secretory granules resembling those in mammalian EC, S, A-like, EG and D cells (terminology of Solcia et al., 1973), and were on(More)
Two- to ten-somite chick embryos were studied in order to ascertain whether, as has been proposed, there exists a 'ventral neural ridge' which gives rise to the hypophyseal (Rathke's) pouch. Serial sections and stereo-microscopy were used. The neural ridges arch around the rostral end of the embryo onto the ventral surface of the head, but no evidence was(More)
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