Different strategies to generate pluripotent stem cells [24, 51–53]. Abbreviations: ag-haESC, androgenetic haploid embryonic stem cell; ESC, embryonic stem cell; HLA, human leukocyte antigen; ICM, inner cell mass; iPSC, induced pluripotent stem cell; miRNA, micro-RNA; NK, natural killer; nt, nuclear transfer; pESC, parthenogenetic embryonic stem cell; SCNT, somatic cell nuclear transfer.