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. 2009 Jan 26;7:8. doi: 10.1186/1477-7827-7-8

Figure 4.

Figure 4

The differentiation of trophoblast cells in placental villi [54]. Fusion of villous cytotrophoblast cells is controlled by regular hCG [55]. Extravillous invasive cytotrophoblast cells produce hyperglycosylated hCG [44], while fused syncytiotrophoblast cells make regular hCG [40-42].