What could account for these differences?

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It is tracking patients in these trials to see if genetic differences in their cancers could account for whether or not Tarceva works.

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Nonetheless, in a recent study by Harvard's Richard Murnane and co-authors, differences in mother-child interaction patterns like these were found to account for one-third of the black-white gap in math and English skills at the beginning of kindergarten -- and one-quarter at the end of third grade.

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