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Phenylethyl Alcohol Agar Essay Preview: Phenylethyl Alcohol Agar Report this essay Exercise 4-1: Phenylethyl Alcohol Agar Introduction: Selective media is media that encourage growth of some organisms and discourages growth of others. Phenylethyl Alcohol Agar is an undefined, selective medium that encourages growth of Gram-positive organisms and inhibits growth of most Gram-negative organisms. Sodium chloride.