Correction.

"The Bad Seed" (SN:3/20/04, p. 184) misidentified the journal carrying findings of brain-tumor stem cells stem cells, unspecialized human or animal cells that can produce mature specialized body cells and at the same time replicate themselves. Embryonic stem cells are derived from a blastocyst (the blastula typical of placental mammals; see embryo), which is very young . It was the Sept. 15, 200,3 Cancer Research.

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Title Annotation:	Letters
Publication:	Science News
Article Type:	Correction Notice
Date:	Apr 3, 2004
Words:	27
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