ここね。
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To evaluate whether the iMuSCs could give rise to chimeric mice, a blastocyst injection assay was performed (Fig. 4c). We transferred undifferentiated β-gal+ and GFP-pre-labelled iMuSCs as single cells into BALB/c (Jackson Lab, USA) blastocysts by microinjection following standard procedures[8].
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[8].Nagy, A. Manipulating the mouse embryo: a laboratory manual. 3rd edn, (Cold Spring Harbor Laboratory Press, 2003).