One iPS cell line was particularly effective: 20 out of 151 embryos yielded adult mice, which were fully composed of iPS derived cells over 90% of the time.
FORBES: The Line Between Embryonic And Pluripotent Stem Cell Research Is Blurring
Stem cells can also be derived from cells taken from an adult.
In addition to producing stem cells to treat spinal cord injuries, Geron says, it has seven other types of cells derived from stem cells in its pipeline.
The material was then treated with a series of enzymes and centrifuged until cells, known as adipose-derived stromal cells, remained.
Scientific advances such as these put human iPS cells into the same spotlight that embryo-derived hES cells have been under since 2001.
FORBES: The Line Between Embryonic And Pluripotent Stem Cell Research Is Blurring
And Geron of Menlo Park, Calif. is performing animal studies on a variety of different cells derived from human embryonic stem cells, aiming to treat spinal cord injury, heart disease and diabetes.
And Geron (nasdaq: GERN - news - people ) of Menlo Park, Calif. is performing animal studies on a variety of different cells derived from human embryonic stem cells, aiming to treat spinal cord injury, heart disease and diabetes.
Also known as reprogrammed stem cells, iPSCs are derived from somatic cells taken from adults, and offer researchers a way to examine the development of diseases.
FORBES: Aberrations Pose A Challenge for Reprogramming Stem Cells
In mice, Daley and colleagues have shown that stem cells derived from the nuclear transfer of cells to make embryos -- the technique described in Mitalipov's paper -- were indeed closer to natural embryo stem cells than induced pluripotent stem cells.
Scientists found however, that feeder cells and serums derived from other animal cells introduced disease-causing agents that compromised the quality of the cell lines.
FORBES: Aberrations Pose A Challenge for Reprogramming Stem Cells
Stem cells derived from umbilical cords are less versatile than embryonic stem cells, which could conceivably replace any cell in the body.
These iPS cells, like stem cells derived from embryos, can be turned into many different kinds of cells, and researchers believe they eventually could be used to regenerate tissue for organs and repair damage.
That means the controversy about using stem cells derived from human embryos is largely absent from this line of research.
These trials use cells derived from a wide range of human sources.
Because they are derived from human cells with human diseases, they are likely to be more effective than some forms of animal testing.
BBC: Embryonic stem cells can be turned into any kind of cell
President George W. Bush 's decision to allow federal funding for research on stem cells derived from human embryos does not change this.
Hwang apologized publicly in January 2006 after a panel of scientists from Seoul National University found he had not derived human stem cells from eggs, as he claimed.
Because of this concern, it was felt that regulators at the Food and Drug Administration might be reticent to approve therapies derived from the cells as a result.
For about a decade, scientists have experimented with the use of stem cells to try and repair the heart, mostly in animals and mostly using stem cells derived from bone marrow.
In order to be useful to scientists, cells derived from embryos also must be able to divide almost endlessly and be able to turn into any type of human tissue, at least in theory.
Then, within several days, embryos genetically identical to the baby were created, from which stem cells were derived.
Widely known for its oncology franchise, Celgene is expanding its medical applications to include inflammation, immune disorders and proprietary stem cell products derived from human placental cells.
But it is not yet known whether tissues derived from embryonic stem cells would cause transplant rejection, whereas this does not seem to be a problem with adult stem cells.
Edward Kennedy, D-Massachusetts, who heads the committee, requested the names of the research groups who have human embryonic stem cell lines, information on where their research has been published, and details about proprietary rights and what ethical standards were used when the stem cells were derived.
Geron and GE Healthcare, a division of General Electric, are developing and commercializing cellular assay products derived from human embryonic stem cells for use in drug discovery, development and toxicity screening.
General Electric ( GE - news - people ), are developing and commercializing cellular assay products derived from human embryonic stem cells for use in drug discovery, development and toxicity screening.
Two years later, though, one researcher derived the first human embryonic stem cells by turning to private funding.
Researchers from the Georgia Institute of Technology and Purdue University have jointly devised a patent-pending method to build organic solar cells using plant-derived substrates.
Biologic drugs are protein-based and derived from living matter or manufactured in living cells using recombinant DNA biotechnologies.
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