In situ hybridization with a heregulin (HRG) antisense probe in tumors obtained from HRG-
transfected MCF-7 cells in nude mice. Paraffin-embedded sections from tumors derived from
MCF-7/HRG-transfected cells are shown in the lower panel, and tumors derived from the
parental MCF-7 cells treated with estrogen are shown in the upper panel. For details, see
article by Atlas et al. on p. 165 this issue.

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