Chemex Pharmaceuticals Inc. said that the company's joint venturewith Block Drug Co. Inc. is expected to begin a clinical study by theend of the year to test the safety and efficacy of low concentrationsof masoprocol cream for reversing photo-aging of the skin.Masoprocol is the active ingredient in Actinex, a topical treatment foractinic keratoses, which Chemex of Fort Lee, N.J., developed and soldto Block Drug, which currently markets it.

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