Fig. 1.

Tadpole and froglet pancreas histology. A: Transverse section of a tadpole (NF55), showing the positioning of the pancreas relative to the rest of the gut. n, notochord; s, stomach; p, pancreas; l, liver; i, intestine. B: Higher magnification of the lower left-hand corner of A. C: Electron micrograph image (×4,500) of froglet pancreas endocrine cells. At least three different endocrine cells are visible, with two acinar cells in the top left corner. D: EM image (×2,500) of exocrine cells from the same froglet pancreas, illustrating the floral/floret pattern of acinar cells, surrounding a duct.