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Adenosine concentrations in epicardial discs or chambers of varied thickness for 2 mins of equilibration. Open squares: data of Gidday et al., 1991; the point at 1000 μm is for a well chamber at 4 mins. Solid squares: unhindered diffusion from a constant source. Solid and open diamonds: unhindered diffusion from constant sources 100 and 200 μm deep in the epicardial surface of the heart.
