Although the word chondroblast is commonly used to describe an immature chondrocyte, the term is imprecise, since the progenitor of chondrocytes (which are mesenchymal stem cells) can differentiate into various cell types, including osteoblasts
choanocyte. n. 1. (Zoology) any of the flagellated cells in sponges that maintain a flow of water through the body. A collar of protoplasm surrounds the base of the flagellum. Also called: collar cell.
Choroidal melanoma. General information. A melanoma is a type of cancer that arises from pigmented cells. We have pigmented cells, called melanocytes, in many parts of our bodies, including the eye. As most of these melanocytes are in the skin, the most common place for a melanoma to occur is in the skin.