Multiple tissue Northern blot analysis of mouse Ap2β1 and β-actin transcripts in total RNA. Thirty-five micrograms of total RNA was blotted in each lane. The blot was hybridized with a cocktail of Ap2β1 C-terminal and N-terminal probes, stripped, and re-hybridized with a 600-bp murine β-actin probe. Tissues surveyed were the liver, spleen, skin, brain, skeletal muscle, tongue, hard palate, heart, kidney and lung.