Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
Human chromosome count
Human chromosome count: The usual number of chromosomes in humans, 46 chromosomes. Also called the human chromosome complement.
History: For half a century, the human chromosome count was widely believed to be 48. That changed on Dec. 22, 1955. On that day at the Institute of Genetics of the Unive...
Human cloning: Human cloning for the purposes of creating a human being. Also called human reproductive cloning. The physician and essayist Lewis Thomas commented: "The cloning of human beings is on most of the lists of things to worry about from science, along with behavior-control, genetic enginee...
Human Development, . . . (NICHD)
Human Development, National Institute of Child Health and (NICHD): One of the US National Institutes of Health, NICHD is in a sense the NIH for kids in that it is concerned with
The mission of the NICHD is, in formal terms, to support and conduct "research on fertility, pregnancy,...
Human embryonic stem cell
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 de...
Human gene map
Human gene map: The locations of the human genes. The location of each gene is called a locus (plural: loci).
The total number of known gene loci on the human gene map as of June 24, 2000 was 6270. Chromosome 1 contained the most gene loci, namely 627, while the Y chromosome had the fewest, namely ...
Human gene therapy
Human gene therapy: Insertion of normal DNA directly
into cells to correct a genetic defect. The treatment of disease by
replacing, altering, or supplementing a gene that is absent or
abnormal and whose absence or abnormality is responsible for a
In studies of gene therapy for cancer, f...
Human genome: All of the DNA that a person possesses. The human genome is made up of all of the DNA in our chromosomes as well as that in our mitochondria. (Each of us has, in fact, two genomes -- a large chromosomal genome and a much smaller mitochondrial genome.) Our genome also includes every gen...
Human Genome Organisation
Human Genome Organisation: The
international organization of scientists involved in the Human Genome Project, the global initiative to map and sequence the human
The Human Genome Organisation (HUGO) was established in 1989 by a group of the world's leading genome scientists to promote in...
Human Genome Project
Human Genome Project:
International effort aimed at identifying and sequencing (ordering) all of the bases in the human genome. American
participation in this monumental undertaking has been supported by funds from
the National Institutes of Health (NIH) and the Department of Energy
Human Genome Research Institute, National
Human Genome Research
Institute, National (NHGRI): One of the newest of the National
Institutes of Health (NIH), NHGRI's mission in formal terms is
to "support the NIH component of the Human Genome Project,
a worldwide research effort designed to analyze the
structure of human DNA and determi...
Human growth: See: Normal growth....
Human herpesvirus 1 (HHV-1)
Human herpesvirus 1 (HHV-1): A herpes virus that causes
cold sores and fever blisters in and around the mouth. Here is a depiction of a typical fever blister caused by HHV-1:
In rare cases, as when the immune system is severely compromised, this virus can cause infection of the brain (encephalitis...
Human herpesvirus 2 (HHV-2)
Human herpesvirus 2 (HHV-2): A herpes virus that causes
genital herpes, characterized by sores in the area of the genitalia. Genital herpes is a sexually transmitted disease (STD).
This virus, like human herpesvirus 1, can cause infection of the brain (encephalitis) if the immune system is severel...
Human herpesvirus 3
Human herpesvirus 3: See herpes zoster....
Human herpesvirus 4
Human herpesvirus 4: See Epstein-Barr virus....