medical services, namely, fertility evaluation, testing and treatment services; extracting, sorting and treating reproductive tissue; isolating and injecting mitochondria to improve oocyte function; generating eggs ex vivo from tissue, and treating oocytes with media to improve oocyte quality; isolating egg precursor cells from tissue and processing the egg precursor cells to generate mature oocytes ex vivo for use by clinicians, biologists and scientists; generating purified mitochondria from egg precursor cells; fertilizing an oocyte to create a bio-energetically-competent embryo or pre-implantation-stage zygote; transferring a competent embryo or pre-implantation-stage zygote to a female subject during a fertility procedure; extracting, sorting and treating reproductive tissue to produce a purified fraction of egg oocyte precursor or progenitor cells; maturing oocyte precursor or progenitor cells to produce viable oocytes; generating a composition consisting of egg precursor cells; injecting a composition of egg precursor cells into the ovary