They say the discovery may in future solve the shortage of donated eggs and sperm needed for fertility treatment. Some experts are claiming the technique comes as well near human cloning and are currently cautioning that the discovery raises severe ethical questions. They say that it could imply that a single man could provide both the sperm and egg for fertility treatment, making him genetically parents of his child. Researchers from the Center for Stem Cell Biology at the University of Sheffield deny these claims. The team studied six individual embryonic stem cell lines taken from extremely early embryos that had been donated by couples undergoing IVF treatment. Related StoriesResearch results may provide new approach to treating male infertilityRGS2 proteins plays significant role in healthful egg-sperm union in miceINVO Bioscience obtains de novo clearance from FDA for INVOcell fertility treatmentThese cell lines will be the building blocks of human advancement and turn into any kind of cell, such as tissue or organs.Related StoriesHeart of the Rockies Regional Medical Center selects Aprima EHRLoyola Medication, Palos Community Medical center jointly release innovative telemedicine programGlan Clwyd Hospital N Wales invest in Esaote's G-Scan MRI unit for weight-bearing scanningThe scheme is being piloted in the NHS North West area, where hospitals in the top two performing quartiles are offered 4 percent and 2 percent increases in tariff payments and there are no penalties for those with low ratings.