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Model of a villus with an extravillous trophoblast column invading the maternal decidua. Below this model, showing different cell types within and originating from a villus, a table shows the STOX1 methylation pattern observed or hypothesized to be found in the different cell types. YY: placenta homozygous for the Y-allele; HH: placenta homozygous for the H-allele; uu: both alleles are unmethylated; mm: both alleles are methylated; um: imprinting (only one allele is methylated).
