Using skin cells extracted from mice, researchers in Japan have produced fully functional egg cells that were used to produce healthy mouse pups. Should the method work in humans, it could introduce powerful new ways of treating infertility—and even allow same-sex couples to produce biological offspring.-source gizmodo link
Very interesting news from gizmodo. Also while it may require genetic screening and probably modification to fix any genetic mistakes that may become more common, it may also hypothetically allow the same lone individual to produce offspring.
In an older article it was seen that sperm cells were also produced from stem cells in other animals.
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