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Testing complementation by using a heterokaryon
Intradermal drug administration: (b) the administration site is prepped Source: Pearson Education/PH
) Intradermal drug administration: (d) the needle is removed and the puncture site is covered with
Subcutaneous drug administration: (a) cross section of skin showing depth of needle insertion;
Early in the twentieth century, when malnutrition was common, companies such as this one advertised
Drug Approval Stages