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10 / 12  Which of the following chemical mediators is secreted onto the surface of the skin?
A  cerumen
B  sebum
C  gastric acid
D  prostaglandin
Practice MCQ 5

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Source:  OpenStax, Microbiology. OpenStax CNX. Nov 01, 2016 Download for free at http://cnx.org/content/col12087/1.4
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