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1 Fels Research Institute, Yellow Springs, Ohio
Comparing the size of the permanent teeth in like-sexed and unlike-sexed siblings, it is clear that sister-sister correlations (averaging 0.64) exceed brother-brother correlations (averaging 0.38), and that these in turn exceed sister-brother correlations (mean r = 0.21)all suggestive of X-chromosomal involvement.
Submitted on March 2, 1964
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