Placenta growth factor (PlGF) is a member of the vascular endothelial growth factor (VEGF) family and promotes endothelial cell growth and angiogenesis. PlGF is secreted as a homodimer and may also form a heterodimer with VEGF. PlGF is detected in the placenta, heart, lungs, thyroid, and adipose tissues. Circulating PlGF levels are correlated with colorectal and renal cancers, as well as atherosclerosis and ischemic heart disease. There are four alternatively spliced PlGF isoforms (PlGF-1, PlGF-2, PlGF-3, and PlGF-4), each with unique secretion patterns and hep
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