Question

fill in the blank question
a mitotic stimulant secreted by platelets and endothelial cells is called platelet - derived \boxed{} factor.
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Explanation:

The question is about a mitotic stimulant related to platelets and endothelial cells. In biology (a subfield of Natural Science), platelet - derived growth factor (PDGF) is a mitotic stimulant secreted by platelets and endothelial cells. So the blank should be filled with "growth".

Answer:

growth