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Expression of PCNA by A549 (top) or 3T3 (bottom) cells after exposure to 0.1 μM or 1 μM GHRH (1–29)NH2 and 0.1 μM or 1 μM GHRH antagonist MZ-5–156. Protein levels were normalized to β actin signal (loading control). The blot is representative of two independent experiments.
