✦ LIBER ✦

Cell division and differentiation in the growth of specialized vertebrate tissues

✍ Scribed by Arthur Cohen; N. J. Berrill

Publisher: John Wiley and Sons
Year: 1936
Tongue: English
Weight: 1010 KB
Volume: 60
Category: Article
ISSN: 0362-2525
DOI: 10.1002/jmor.1050600113

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The post‐embryonic growth of the notochord, sensory retinal cells, cartilage and gut epithelium in frog tadpoles, trout and lamprey is described. Increase in the number of notochord and sensory retinal cells results only from the mitotic division of cells which have not yet undergone the structural modifications characteristic for these cells. The specialized and functional cell does not divide. In the frog tadpole the cartilage cells increase by mitotic division of the fully‐formed and functional cell: in addition there are centers of proliferation consisting of small, rapidly‐dividing cells. The trout is similar except that there are no centers of proliferation, in addition amitotic division occurs. The gut epithelium grows by mitotic division of the functional constituent cells. During division the cell assumes a spherical shape and its functional activities are suspended.

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