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- V2 receptors
- Vaccine
- Preparation of dead or weakened pathogens, or their products, which when introduced into the body, stimulates the production of protective T cells and/or antibodies without causing the disease. [Discussion] [flu vaccines] [against AIDS] [against smallpox]
- Vacuoles, in plant cells
- Vagus nerves
- [effect on the heart]
- Valence
- Number of electrons gained, lost, or shared by an atom in bonding to one or more other atoms. [Discussion] [types of chemical bonds between atoms]
- Valine
- Variable number of tandem repeats (VNTRs)
- Variant surface glycoprotein (VSG) of trypanosomes
- Variation, continuous
- Variola virus
- Variolation
- Vascular
- Containing vessels that conduct liquid.
- Vasectomy
- Vasopressin (arginine vasopressin, the antidiuretic hormone)
- V(D)J Joining
- Vector
- (1) An animal (e.g., an insect) that transmits a parasite. [Example] Reducing the population of a vector is often a good way to lower the incidence of the disease it transmits. (2) In genetic engineering, a virus or plasmid that carries a molecule of recombinant DNA into a cell, thus transforming it. [retroviral vectors] [adeno-associated virus (AAV) as a vector]
- VegT
- Ventral tegmental area (VTA)
- Vernalization
- Vertebrate
- Any backboned animal. Includes fishes, amphibians, reptiles, birds, and mammals. [Discussion] [comparative kidney structure and function]
- Vestigial
- Term applied to a degenerate or incompletely developed structure which was more fully developed at an earlier stage of the organism and/or its ancestors.
- Vibrio cholerae
- Viking missions to Mars
- Villi
- Vimentins
- Virion
- Viroids
- Viruses
- [general discussion] [latent] [RNA]
- Virusoids
- Viscera
- Organs in the body cavity.
- Vision
- [in humans] [processing visual information] [in insects] [ultraviolet]
- Vitamins
- [in human nutrition] [Recommended Dietary Allowances (RDAs)]
- Vitamin K
- Vitaxin
- Vitreous body
- Viviparous
- Having embryos that develop to adult form within the mother's body while securing most of their nourishment from the mother's tissues rather than from the yolk of the egg.
- Vomeronasal organ (VNO)
- von Frisch, K.
- von Willebrand Factor (vWF)
- VR1 receptors