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Fig. 1. NOS activity obtained from intestinal homogenates of rats fed either a normal, zinc-sufficient diet; a zinc-deficient diet for three weeks, prior to and after being given five days of cathartic solution; after cathartic treatment and recovery with ORS without zinc (-Zn) or with 1 mM zinc (+Zn); and zinc-deficient rats not exposed to cathartic, but given either ORS for two days. The error brackets indicate the SEM. The number of animals is that of Tables 1 and 2. 
Indicates a significant difference (p < 0.05) respect of all other groups.
