Corrections and Clarifications


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Science  10 Sep 1982:
Vol. 217, Issue 4564, pp. 984
DOI: 10.1126/science.217.4564.984-b


Figure 2 (left) in the report "Transformation induced by Abelson murine leukemia virus involves production of a polypeptide growth factor" by D. R. Twardzik et al. (21 May, p. 894) was incorrect. It showed transforming growth factor (TGF) purified from human melanoma cells rather than from the Abelson virus-transformed rat cells. The correct figure from the very same gel is shown below. Although one portion of the gel was used rather than another, none of the conclusions reached in the report are affected. Both rat and human TGF's have molecular weights of 7400 and have very similar amino acid compositions and NH2-terminal amino acid sequences.

[See figure in the PDF file]