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    1. Follistatin Protein that blocks activin, a growth-regulating signal
    2. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    3. Clascoterone Topical androgen-receptor blocker, approved as an acne cream
    4. Tretinoin Vitamin A retinoid cream, prescribed for acne
    5. Thymosin Beta 4