what is the problem of stem cells
Biologists Discover Solution to Problem Limiting Development of Human Stem Cell Therapies. The biologists developed âhumanizedâ laboratory mice that contained a functional human immune system. Credit: Zhili Rong, UC San Diego. Biologists at UC San Diego have discovered an effective strategy that could prevent the human immune system from rejecting the grafts derived from human embryonic stem cells, a major problem now limiting the development of human stem cell therapies.