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