The best replacement for stem cells is bone marrow.

The best alternatives to stem cells are rated as following:
★★★★★  bone marrow
★★★★  adult stem cells
★★★  embryonic stem cells
★★★  embryonic
★★★  cloning
★★  progenitor cells
★★  normal cells
★★  cord blood
★  regular cells
★  umbilical stem cells
★  cancer cells
★  somatic cells
★  embryonic stem cell research
★  differentiated cells
★  other cells
  embryo stem cells
  cord blood stem cells
  therapeutic cloning
  cancer stem cells
  germ cells
  cells
  gene therapy
  cochlear implants
  blood
  placenta
  pluripotent
  clonal evolution
  mesenchymal stem cells
  embryonic cells

Your alternative for stem cells is not listed? Suggest!
Speaking about stem cells, one probably shouldn't forget about killing embryos.

Other search terms related to stem cells and their ratings are:
★★★★★ killing embryos
★★★★★ kidney transplant
★★ parkinson's disease
★ prolotherapy
★ parkinson's
embryo
spinal cord injuries
ethical
You have in mind a companion for stem cells and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of stem cells in all years. Click on graph for more.
stem cells
bone marrow
adult stem cells