"Pigment granules" are small particles that contain color. They are found in things like paint, ink, and living organisms like animals and plants. These granules determine the color of something and give it its hue or shade. Full definition
A black Lab or Boerboel will have a different type of pigment granule in those hair shafts. (siriusdog.com)
Such a dog will carry the genes for arranging pigment granules in the nose and other integument to show black, liver, or blue, but nothing at the E locus that allows anything other than tan hairs (or tan with brindle striping). (siriusdog.com)
The presence of intracellular pigment granules along with the absence of a subretinal cellular debris zone raise the possibility that these donor cells have (or acquire) the capacity to phagocytose surrounding waste material. (journals.plos.org)