The RNA assay Minikit (Quiagen, Hilden, Germany) with DNAse I treatment was used to extract total RNA, as previously reported [22 (link)]. RNA obtained from differentiated MSCs, SW1353, and CPCs was then quantified spectrophotometrically. The RNA preparation was considered pure when the 260/280 nm absorbance ratio was in the 1.8 to 2.0 range. For gene expression studies related to CPCs, RNA samples were pooled across the six subjects in order to reduce the bias that each individual might introduce.
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