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In loco and systematic alteration in vitamin A content during tail regeneration in the gekkonid lizard, Hemidactylus,flaviviridis

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A quantitative evaluation was made of the levels of vitamin A in the liver, kidney and tail regenerate during tail regeneration in H. flaviviridis. Vitamin A in the liver increased on the first three days and decreased on the 5th day post-autotomy; a second increase was noted on the 7th day. Thereafter a subnormal level was noted on the 10th, 15th and 25th days. Vitamin A levels in the tail remained raised throughout regeneration except on the 7th and 60th days when the levels were in the normal (pre-autotomy) range. Kidney vitamin A content showed a steep increase on the 10th day while at other periods it remained in the normal range. The depletion in hepatic vitamin A content corresponded with high vitamin content in the regenerate, indicating the mobilization of this vitamin to the site of regeneration. The decreased level during dedifferentiation indicates greater utilisation of this vitamin. Supra normal levels of vitamin A in the regenerate during the blastemic and differentiation phases suggest an intimate association of this vitamin with the many events characteristic of these phases of regeneration.

Affiliations: 1: Division of Developmental Physiology, Department of Zoology, Faculty of Science, The M. S. University of Baroda, Baroda 390 002, India


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