Table 3 IC50 calcium displacement values for various peptides/proteins. The molecular weights and the IC50-values (concentration of the peptides/proteins necessary to displace 50% of the calcium adsorbed to LPSF515 monolayers) are shown. 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; the LPSF515 concentration was 9.6 nmol (160 nM).