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What does the bulge of a hair follicle contain?

  1. Melanin-producing cells

  2. Sebaceous glands

  3. Cells responsible for regulating the hair growth cycle

  4. Cells that produce sebum

The correct answer is: Cells responsible for regulating the hair growth cycle

The bulge of a hair follicle contains cells responsible for regulating the hair growth cycle. These cells play a crucial role in the growth and shedding of hair. The other options are incorrect because melanin-producing cells are responsible for pigmentation, sebaceous glands produce sebum to lubricate the hair and skin, and cells that produce sebum are specifically related to oil production, not the regulation of the hair growth cycle.