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(gran′ūl″ )

[L. granulum, little grain]

1. A small grainlike mass.
2. In histology, a small intracellular mass that has no apparent internal structure.

A granule that stains readily with acid dyes.

A cytoplasmic granule in many normal cells. It is not affected by ether or chloroform, but disappears from view when acetic acid is added.

A granule found within platelets that secretes several substances that aid blood clotting including fibrinogen, platelet-derived growth factor, thrombospondin, selectins, and von Willebrand factor.

SEE: Beta granule.

A small red or reddish-purple granule that easily takes a stain with azure dyes. Found in lymphocytes and monocytes, it is inconstant in number, being present in about 30% of the cells.

SEE: Basal body.

A cellular granule that stains with a basic dye.

An azurophil granule found in beta cells of the hypophysis or islets of Langerhans of the pancreas that stains with both acid and basic dyes.
SYN: SEE: amphophil granule

SEE: Nissl body.

The nuclei of the cones, sensory cells of the retina. They form the outer zone of the outer nuclear layer of the retina.

A small granule in the delta cells of the pancreas.

A granule within platelets that carries several substances that help blood to clot, including adenosine diphosphate, adenosine triphophate, histamines, ionized calcium, and serotonin.

One of various granules that react with acid dyes. It is present in eosinophils.

One of the minute particles of glycogen seen in liver cells following fixation.

A granule found within the juxtaglomerular cells of the kidneys. Juxtaglomerular cells secrete renin.

A granule in the sarcoplasm of a striated muscle fiber.

An irregularly sized granule found in the protoplasm of numerous bacteria. It stains a different color from that of the dye used.

SEE: Much granules

Any of the cytoplasmic granules of a neutrophil that often stain a pale blue.

SEE: Nissl bodies.

A granule seen in pigment cells.

A basophilic granule seen in the conjugating form of Plasmodium vivax.

A minute protein particle found in cells.

A nucleus of a rod photoreceptor found in the retina.

SEE: Schüffner, Wilhelm A. P.

SEE: Zymogen granule.

One of the minute particles in semen, supposed to derive from disintegrated nuclei in nutritive cells from seminiferous tubules.

A granule present in gland cells, esp. the secretory cells of the pancreas, the chief cells of the gastric glands, and the serous cells of the salivary glands. It is the precursor of the enzyme secreted.
SYN: SEE: secretory granule.

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