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Dependence of the β-intensity on area and lateral pressure of LPS F515 monolayers. (A) Pressure/area isotherm of a LPS F515 monolayer. (B) Linear change of the β-intensity of 45Ca2+ adsorbed on the monolayer determined under a constant area of the monolayer (green line: linear fit). Bathing solution: 12.5 μM calcium doped with radioactive 45Ca2+ resulting in a relative β-activity of 250 Bq/ml, buffered with 5 mM HEPES, and adjusted to pH7.
