sentences:  Experts noted that there was little chance of these techniques being applied to humans in the near future.Scientists from the University of Newcastle upon Tyne led by biologist Karim Nayernia discovered a method of creating partly developed sperm cells, otherwise known as "spermatogonial" stem cells, from the bone marrow of male volunteers, entirely in-vitro (outside the human body), and is seeking funding to see whether such techniques can be used to make female sperm.If created, a "female sperm" cell could fertilize an egg cell, a procedure that, among other potential applications, might enable female same-sex couples to produce a child who would be the biological offspring of their two mothers.