Source:http://linkedlifedata.com/resource/umls/id/C0035286
MSH: Immature ERYTHROCYTES. In humans, these are ERYTHROID CELLS that have just undergone extrusion of their CELL NUCLEUS. They still contain some organelles that gradually decrease in number as the cells mature. RIBOSOMES are last to disappear. Certain staining techniques cause components of the ribosomes to precipitate into characteristic "reticulum" (not the same as the ENDOPLASMIC RETICULUM), hence the name reticulocytes.,CSP: immature erythrocytes showing a basophilic reticulum under vital staining; in humans, these are erythroid cells that have just undergone extrusion of their cell nucleus.,NCI: Immature erythrocytes that have just undergone extrusion of their cell nucleus. They still contain some organelles that gradually decrease in number as the cells mature.