Answer:
Williams syndrome was first described by J. C. P. Williams and his colleagues, who wrote in 1961 of four patients with supravalvular aortic stenosis, mental disability, and facial features including a broad forehead, large chin, low-set, "drooping" cheeks, widely spaced eyes, and wide-set mouth.
Williams syndrome is caused by a missing piece ( deletion ) of genetic material from a specific region of chromosome 7. The deleted region includes more than 25 genes . CLIP2, ELN, GTF2I, GTF2IRD1, and LIMK1 are among the genes that are typically deleted in people with Williams syndrome.
illiams syndrome is characterised by poor visuo-spatial abilities alongside relatively preserved language skills, whereas Down's syndrome is characterised by lower language skills alongside less impaired visuo-spatial skills
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