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Most likely a metamyelocyte or monocyte.. Of course, "Kidney-bean-shaped" is a pretty broad description, and many cells could have that vague appearance on a slide. Most commonly that description is associated with metamyelocytes, which are immature Granulocytes (Segs, Eos, and Basos). However, if the question was in reference to a fully matured WBC, it likely would be a monocyte. If you are trying to tell them apart, remember monocytes (like lymphs) are not Granulocytes, and should not have cytoplasmic granules. A meta will (usually) have granules.
monocyte
They do not have granules.A large nucleus is precent.They are the largest cells in blood stream.
erothyctes
it contains single nuclaes
Monocyte is singular. Monocytes is plural.
The type of leukocyte that becomes a macrophage is a monocyte. Macrophages are cells that digest cellular debris and pathogens.
Monocytes are a type of white blood cell. A high monocyte count in the blood could mean an infection caused by a virus or parasite. It could also be indicative of chronic inflammatory disease.
Three and photothensisis
it is in case of infection .
Monocyte
A type of cell of the human immune system that ingests bacteria, viruses, and other foreign matter, thus removing potentially harmful substances from the bloodstream. These substances are usually then digested within the phagocyte.