Abstract: Methods of generating a synthetic embryo are provided. Accordingly, there is provided a method of generating a synthetic embryo comprising inducing expression of a factor that induces differentiation to trophectoderm cells in a subpopulation of naïve pluripotent stem cells (PSCs) to obtain a trophectoderm primed cells; inducing expression of a factor that induces differentiation to extra embryonic primitive endodermal cells in a second subpopulation of naïve PSCs to obtain extra embryonic primitive endodermal primed cells; and mixing said trophectoderm primed cells and said extra embryonic primitive endodermal primed cells with naïve PSCs under conditions that allow formation of aggregated cells. Also provided are articles of manufactures, mixtures and aggregates of cells and methods of using same.

Abstract: A culture medium is disclosed which comprises STAT3 activator, an ERK1/2 inhibitor and an Axin stabilizer, and optionally also a PKC inhibitor. Cell cultures comprising same and uses thereof are also disclosed.

Abstract: Methods of generating a synthetic embryo are provided. Accordingly, there is provided a method of generating a synthetic embryo comprising inducing expression of a factor that induces differentiation to trophectoderm cells in a subpopulation of naïve pluripotent stem cells (PSCs) to obtain a trophectoderm primed cells; inducing expression of a factor that induces differentiation to extra embryonic primitive endodermal cells in a second subpopulation of naïve PSCs to obtain extra embryonic primitive endodermal primed cells; and mixing said trophectoderm primed cells and said extra embryonic primitive endodermal primed cells with naïve PSCs under conditions that allow formation of aggregated cells. Also provided are articles of manufactures, mixtures and aggregates of cells and methods of using same.

Abstract: A culture medium comprising a WNT inhibitor, a SRC inhibitor and a protein kinase C (PKC) inhibitor is disclosed. The medium is devoid of an amount of GSK3beta inhibitor that increases beta-catenin translocation to the nucleus of a pluripotent stem cell being cultured in the culture medium. Uses thereof are also disclosed.

Abstract: Provided is an isolated human naive pluripotent stem cell (PSC), wherein: (i) when the naive PSC is a female PSC, then said naive female PSC has two unmethylated alleles of an X-inactive specific transcript (XIST) gene; and (ii) when said naive PSC is a male PSC, then said naive male PSC has an unmethylated allele of said XIST gene. Also provided is a culture medium which comprises an ERK1/2 inhibitor, a GSK3beta inhibitor, a p38 inhibitor, a JNK inhibitor, a STAT3 activator and at least one agent selected from the group consisting of: bFGF, TGFbeta 1, a PKC inhibitor, a ROCK inhibitor and a NOTCH inhibitor; or at least agent selected from the group consisting of: a TGFR inhibitor, a FGFR inhibitor, a PKC inhibitor, a ROCK inhibitor and a NOTCH inhibitor.

Abstract: Provided is an isolated human naive pluripotent stem cell (PSC), wherein: (i) when the naive PSC is a female PSC, then said naive female PSC has two unmethylated alleles of an X-inactive specific transcript (XIST) gene; and (ii) when said naive PSC is a male PSC, then said naive male PSC has an unmethylated allele of said XIST gene. Also provided is a culture medium which comprises an ERK1/2 inhibitor, a GSK3beta inhibitor, a p38 inhibitor, a JNK inhibitor, a STAT3 activator and at least one agent selected from the group consisting of: bFGF, TGFbeta 1, a PKC inhibitor, a ROCK inhibitor and a NOTCH inhibitor; or at least agent selected from the group consisting of: a TGFR inhibitor, a FGFR inhibitor, a PKC inhibitor, a ROCK inhibitor and a NOTCH inhibitor.

Abstract: A culture medium is disclosed which comprises STAT3 activator, an ERK1/2 inhibitor and an Axin stabilizer, and optionally also a PKC inhibitor. Cell cultures comprising same and uses thereof are also disclosed.

Abstract: Provided is an isolated human naive pluripotent stem cell (PSC), wherein: (i) when the naive PSC is a female PSC, then said naive female PSC has two unmethylated alleles of an X-inactive specific transcript (XIST) gene; and (ii) when said naive PSC is a male PSC, then said naive male PSC has an unmethylated allele of said XIST gene. Also provided is a culture medium which comprises an ERK1/2 inhibitor, a GSK3beta inhibitor, a p38 inhibitor, a JNK inhibitor, a STAT3 activator and at least one agent selected from the group consisting of: bFGF, TGFbeta 1, a PKC inhibitor, a ROCK inhibitor and a NOTCH inhibitor; or at least agent selected from the group consisting of: a TGFR inhibitor, a FGFR inhibitor, a PKC inhibitor, a ROCK inhibitor and a NOTCH inhibitor.