Quotation: "While embryonic stem cells are generally believed to have the greatest therapeutic potential, because of their ability to become virtually any kind of cell or tissue in the body, most stem cells are not derived from embryo" (Steinbock, 2011).

Paraphrase: According to Steinbock (2011), Even though many embryonic stem cells has believed an important ability to cure diseases and turn into different cell of our body, embryo is not the only source of the stem cells.

Summary: Although embryonic stem cells are very useful due to their transformation into any sort of our cell body, stem cells can be evolved from other source rather that embryo (Steinbock, 2011).

Citation: Steinbock, Bonnie. Life Before Birth. New York, Oxford University Press, 2011.