Journal
STEM CELLS AND DEVELOPMENT
Volume 15, Issue 4, Pages 523-531Publisher
MARY ANN LIEBERT, INC
DOI: 10.1089/scd.2006.15.523
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Inner cell mass (ICM) cells were isolated immunosurgically from day 7-8 horse blastocysts and, after proliferation in vitro for 15-28 passages, three lines of cells were confirmed to be embryonic stem (ES) cells by their continued expression of alkaline phosphatase activity and their ability to bind antisera specific for the recognized stem cell markers, SSEA-1, TRA-1-60, TRA-1-81, and the key embryonic gene Oct-4. When maintained under feeder cell-free conditions in vitro, the three lines of cells differentiated into cells of ectodermal, endodermal, and mesodermal lineages. However, they did not form teratomata when injected into the testes of severe combined immunodeficiency (SCID)/beige immunoincompetent mice, thereby indicating a significant difference in phenotype between ES cells of the horse and those of the mouse and human.
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