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The songs of three tutors and their sons' imitations. For tutor A and B, the first son shown was an intact control; the second son was unilaterally denervated, and the third was deafened. For tutor C, the first son shown was unilaterally denervated, the second was bilaterally denervated, and the third was unilaterally denervated and deafened. Most sons were raised apart from each other in serial clutches.
