(hCG) A human hormone made by chorionic cells in the fetal part of the placenta. Human chorionic gonadotropin (hCG) is directed at the gonads and stimulates them. Hence, the name “gonadotropin.”
The presence of hCG is detectable by immunologic means within days of fertilization and forms the foundation of the common pregnancy tests. The level of hCG tends to be higher with a female fetus soon after conception.
The level of hCG in maternal serum also enters as one component in the “double” and the “triple” screening tests used during pregnancy to assign risks of Down syndrome and other fetal disorders.
- Human chromosome count
1. Joe Hin Tjio (1919-2001) was born to Chinese parents in Java, then part of the Dutch East Indies, in 1919. After World War II, Tjio did cytogenetic research in the Netherlands, Sweden and Spain. He came to the United States in 1958 and in 1959 joined the staff of the NIH where he spent […]
- Human Development, . . . (NICHD)
One of the US National Institutes of Health, NICHD is in a sense the NIH for kids in that it is concerned with child health. The mission of the NICHD is, in formal terms, to support and conduct “research on fertility, pregnancy, growth, development, and medical rehabilitation (that) strives to ensure that every child is […]
- Human embryonic stem cell
Also known as a human pluripotent stem cell, one of the “cells that are self-replicating, are derived from human embryos or human fetal tissue, and are known to develop into cells and tissues of the three primary germ layers. Although human pluripotent stem cells may be derived from embryos or fetal tissue, such stem cells […]
- Human gene therapy
adenosine deaminase (ADA) deficiency. In late October of 1999 the U.S. moved to require the disclosure of the results of gene therapy. The move by the Recombinant DNA Advisory Committee came 6 weeks after the death of an 18-year-old Arizona man, Jesse Gelsinger, who was apparently the first person to die as a result of […]
- Human Genome Organisation
The international organization of scientists involved in the Human Genome Project, the global initiative to map and sequence the human genome. The Human Genome Organisation (HUGO) was established in 1989 by a group of the world’s leading genome scientists to promote international collaboration within the project. HUGO carries out a complex coordinating role within the […]