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The Journal of Cell Biology, Vol 28, 127-137, Copyright © 1966 by Rockefeller University Press

ARTICLE

INCREASED NUMBERS OF ANNULATE LAMELLAE IN MYOCARDIUM OF CHICK EMBRYOS INCUBATED AT ABNORMAL TEMPERATURES

Leonard Merkow 1 and Joseph Leighton 1

1 From the Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.

Dr. Merkow's present address is the William H. Singer Memorial Research Institute of the Allegheny General Hospital, Pittsburgh

Annulate lamellae have been observed in the myocardium of 18-day-old chick embryos maintained at the normal temperature of 100°F and at 90°F during the last week of incubation. An increased number of annulate lamellae was observed in heart muscle of embryos incubated at 90°F. This is probably caused by a persistent production of these organelles, since annulate lamellae are present in greater frequency than in 11-day-old embryos incubated at 100°F. In the hypertrophic hearts of 18-day-old embryos incubated at 90°F, the annulate lamellae were associated with a net increase of protein content and an elevated concentration of myocardial glycogen. It is suggested that the increased number of annulate lamellae is a sequela of reduced environmental temperature during incubation.

Submitted on August 12, 1965


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