Colony stimulating factors:
a. Have poor affinity for their target cells
b. Require high concentrations to be effective
c. Are produced by many cells
d. Are all lineage specific
ANS: C
Colony stimulating factors need only be present in a very low concentration to be effective. They have a high affinity for their target cells, binding to specific receptors on the cell surface. Many different cells produce them, and many of them affect several different cell lines.
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