Abstract
Whereas embryonic stem (ES) cells are isolated from the embryonic lineage of the blastocyst, other stable stem cell lines can be derived from the extraembryonic tissues of the early mouse embryo. Trophoblast stem (TS) cells are derived from trophectoderm and early postimplantation trophoblast, and extraembryonic endoderm stem (XEN) cells are derived from primitive endoderm. The derivation of XEN cell lines from 3.5-dpc mouse blastocysts, described here, is similar to the derivation of TS cell lines. TS and XEN cells can self-renew in vitro and differentiate in vitro and in chimeras (in vivo) in a lineage-appropriate manner, showing the developmental potential of their origin, thus providing important models to study the mouse extraembryonic lineages.
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