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. Author manuscript; available in PMC: 2015 Aug 25.
Published in final edited form as: J Invest Dermatol. 2010 Apr 8;130(8):2141–2144. doi: 10.1038/jid.2010.74

Figure 1. Role of histidase in SC acidification.

Figure 1

(a) Histidase activity in the stratum corneum (SC) was measured in newborn rats and rats at age 4–5 days (n = 6). (b) The SC surface pH in Peruvian and matched controls was measured with a flat, glass surface electrode (Mettler-Toledo, Giessen, Germany), attached to a pH meter (Skin pH Meter PH 900; Courage & Khazaka, Cologne, Germany). HIS−/−, n = 8; HIS +/−, n = 14; wild type, n = 6.