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19149

It was with great interest that I read this article. I realize that such articles aren’t comprehensive reviews of the literature, but I must point out that we have recently published in Virus Genes direct experimental evidence that supports the involvement of endogenous retrovirus in embryo implantation. Luis P. Villarreal University of California Irvine, Calif.

19189

I feel the need to comment on the misconception that trisomies of other than chromosome 21 don’t survive birth. I have a friend whose daughter is a trisomy 18 and just celebrated her 19th birthday and other friends whose children with trisomies are nearing their teenage years. My own son, a trisomy 13, lived for […]

19148

Newton derived theories about gravity by studying stationary or very slowly moving objects.