These samples will challenge the library to reject the negative controls pharm.

[Natuli]

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To evaluate external specificity, samples which are not in the library are evaluated, which
include both negative and positive controls. These negative controls are similar to, but
not identical to, products in the library, in this case other lyophilized product
formulations manufactured by Merck were used. These samples will challenge the
library to reject the negative controls and accept the positive controls.