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Effect of water-, Leu57-Leu58-His59-Lys60 (LLHK-), Leu58-His59-Lys60 (LHK)-, or His59-Lys60 (HK)-treatment on the morphology of sublingual glands (SLGs). The younger rats were given water (A). The older rats were given water- (B), LLHK- (C), LHK- (D), or HK- (E) for 1 month. Bar, 50 µm.
