For each description below (1-14), select the appropriate cell type (a-o). Each cell type may be used once, more than once, or not at all.

Description:
1. Major cell type presenting antigen to naïve T cells
2. Phagocytic cell of the central nervous system
3. Granulocytic cells important in the body's defense against parasitic organisms
4. Gives rise to red blood cells
5. Generally first cells to arrive at site of inflammation
6. Supports maintenance of HSCS
7. Gives rise to thymocytes
8. Circulating blood cells that differentiate into macrophages in the tissues
9. An antigen-presenting cell that arises from the same precursor as a T cell but not the same as a macrophage
10. Cells that are important in sampling antigens of the intestinal lumen
11. Granulocytic cells that release various pharmacologically active substances
12. White blood cells that play an important role in the development of allergies
13. Cells that express antigen-specific receptors
14. Cells that share a common progenitor with T and B cells, but do not have antigen-specific receptors

Cell Types
a. Common myeloid progenitor cells
b. Monocytes
c. Eosinophils
d. Dendritic cells
e. Innate lymphoid cells
f. Mast cells
g. Neutrophils
h. M cells
i. Osteoblasts
j. Lymphocytes
k. NKT cells
l. Microglial cells
m. Myeloid dendritic cells
n. HSCs
o. Lymphoid dendritic cells