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Transcription factors **regulate gene expression** by helping RNA polymerase bind to DNA and initiating transcription.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Transcription - Mechanism and RNA Polymerase
Tropomyosin regulates muscle contraction by blocking the myosin-binding sites on actin filaments.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle - Types and Structure - Myofibril Sarcomere Myofilament
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