S100A1 and calmodulin compete for the same binding site on ryanodine receptor.
Wright NT, Prosser BL, Varney KM, Zimmer DB, Schneider MF, Weber DJ.
J Biol Chem. 2008 Sep 26;283(39):26676-83. doi: 10.1074/jbc.M804432200. Epub 2008 Jul 23. PMID: 18650434