Current thinking about the cause of Hutchinson-Gilford syndrome,which is a severe segmental progeroid syndrome,is that
A) the body is unable to secrete insulin.
B) the part of the brain that controls aging is damaged.
C) abnormal lamin A protein stresses the nuclear membrane,disturbing DNA repair such that mutations accumulate that cause the diseases of aging.
D) a protein called progerin forms clumps in the brain in a way that removes DNA from the tips of telomeres,shortening chromosomes and lifespan.
Correct Answer:
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A)blastocyst.
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