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Jackson Laboratory

The premiere place for mouse genetics and the largest mammalian genetic research facility in the world. Many of the types of mice used in medical research originated at the laboratory which is in Bar Harbor on Mount Desert Island, Maine. The Jackson Laboratory was founded in 1929 by Dr. Clarence Cook Little, a geneticist, as […]


Near the spinal column. For example, juxtaspinal abscess lies adjacent to the spinal column.


Near the pylorus, the muscular area at the junction of the stomach and the first part of the small intestine. For example, a juxtapyloric ulcer is located near the pylorus.

Juxtaglomerular apparatus

The prefix “juxta-” comes from the Latin preposition meaning near, nearby, close. The juxtaglomerular apparatus is a collective term referring to the cells near a structure called the glomerulus in the kidney. The juxtaglomerular cells are specialized cells that stimulate the secretion of the adrenal hormone aldosterone and play a major role in renal autoregulation, […]


The prefix “juxta-” comes from the Latin preposition meaning near, nearby, close. Juxtaposition is thus the act of placing two or more things side by side or the state of being so placed. To lose a pair of juxtaposed teeth is to lose teeth that are next to one another.


Near a joint. For example, a juxta-articular fracture is a break near a joint.


Prefix meaning near, nearby, or close, as in juxtaspinal (near the spinal column) and juxta-vesicular (near the bladder).

Juvenile retinoschisis

A genetic disease of the eye characterized by retinoschisis (splitting of the retina) symmetrically involving the macula, the area of the retina responsible for central vision, with onset in the first decade of life, in some cases as early as three months of age. Eye examination shows areas of schisis (splitting of the nerve fiber […]

Juvenile polyposis syndrome

An autosomal dominant disorder in which polyps develop throughout the gastrointestinal tract in the first decade or two of life. People with the disease are at increased risk for developing gastrointestinal cancers. Abbreviated JPS. There can also be diarrhea, GI bleeding, and protein-losing from the intestinal wall. JPS is clearly heterogeneous (more than one entity) […]