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tropomyosins are proteins that mediate the interaction of actin and troponin, two proteins involved in muscle contractions. in higher animals, tropomyosins exist as a family of closely related proteins that share some amino acid sequences but differ in others. a. explain what sorts of alternative splicing allow multiple proteins to be generated from a single precursor transcript of this gene. b. explain what molecular experiments you might do to determine which exons are present in different transcripts.