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Isolated rats were either treated with AS (250 μm) for 20 min (•, n = 5) or continuously perfused for 35–40 min (^, n = 6). The Ca2+ for half-maximally activated Mg-ATPase activity (pCa50) was not affected by AS (6.55 ± 0.14 versus 6.70 ± 0.08, control, P = 0.4). See text for details.
