Given the growth rate throughout an embryonic rudiment, one can calculate how its parts must shift as it gets bigger, and so plot fate maps showing their future positions. The calculation is done here for the chick wing-bud from stage 18 to 25, using published data for mitotic index and cell packing density, and new measurements of size and shape. Two main findings are: (1) the wing-bud in this...

verts dCMP to dUMP (13, 19), is present in mammalian tissues and manifests a high activity in such rapidly pro liferating tissues as embryonic tissue or tumors (3, 13, 15, 19). In tissues with a low mitotic index, the activity of the enzyme is quite low. Thus dCMP-deaminase activity is low in adult rat liver but increases when cell proliferation occurs in the organ, as for example after hepatec...

Objective: Extensive research has been done to assess the efficacy of herbs for treating different disorders. Dorema ammoniacum (D. ammoniacum) is used in folk medicines for various goals. The application of herbs in medicine is accompanied by harmful effects. Chick embryo is considered a suitable model for assessing drugs toxicity. The present study aimed to evaluate the chang...