sentence: G-protein β γ activating peptide , myr-SIRKALNILGYPDYD-OH ( mSIRK ) , and its control peptide , myr-SIRKALNIAGYPDYD-OH ( L9A ) , 2-aminoethoxydiphenyl borate ( 2-APB ) , xestopongin C , ryanodine , N - ( 6-aminohexyl ) -1 - naphthalenesulfonamide ( W-5 ) were purchased from EMD Chemicals .