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Activity 3Find the missing word

Pupils should try to fill in the blanks using clues from the rest of the sentence. When in doubt, the length of each blank indicates the length of the missing word. A complete list of words that belong in the blanks is provided at the end of the passage.

New source of stem cells

Scientists have discovered a new ______ of stem cells. It is amniotic fluid - the _____ that surrounds an embryo.

The researchers from Wake Forest University ______ of Medicine have used these stem cells to make ______, bone, fat, blood vessel, nerve and liver cells. _____ report is published today in Nature Biotechnology.

"Our hope is ____ these cells will provide a valuable resource for tissue ______ and for engineered organs," said Anthony Atala, M.D. He __ director of the Institute for Regenerative Medicine at Wake ______.

It was already known that the placenta and amniotic _____ contained many cell types that can develop into fat, ____, and muscle, Atala said.

So he and his __________ asked a question. "Is there a possibility that within ____ cell population we can capture true stem cells?"

The answer, ____ now know, is yes. Atala and his colleagues discovered _ small number of stem cells in amniotic fluid - ______ 1%. They have named them amniotic fluid derived stem _____, or AFS cells for short.

These stem cells ___ generate many of the specialised cells found in the _____ body. The researchers believe AFS cells are an intermediate _____ between embryonic stem cells and adult stem cells.

"It ____ this long to verify that we had a true ____ cell," said Atala. He began the work seven years ___.

"These cells are capable of extensive self-renewal, a ________ property of stem cells. They can be used to _______ a broad range of cells that may be valuable ___ therapy."

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