Nucleus
1) In cell biology, the structure that houses the chromosomes. 2) In neuroanatomy, a group of nerve cells.
Read Also:
- Nude mouse
A mutant mouse said to be nude because it is hairless due to the presence two copies of the gene “nu” (for nude). Nude mice have no thymus and therefore no T cells, a class of lymphocytes that depend on the thymus to develop. For lack of T cells, nude mice cannot reject tumors or […]
- Null mutation
A mutation (a change) in a gene that leads to its not being transcribed into RNA and/or translated into a functional protein product. For example, a null mutation in a gene that usually encodes a specific enzyme leads to the production of a nonfunctional enzyme or no enzyme at all.
- Nullipara
A woman who has not given birth to a viable child.
- Nulliparous
Never having given birth to a child.
- Numb
Numb, or numbness is a loss of the sensation of feeling in an area of the body. Numbness results from damage to, or impaired function of, the nerves that supply the affected area. The function of the nerves may be impaired by numerous causes including some chronic diseases (diabetes mellitus, thyroid disease, migraine), trauma, toxins, […]