P300-EDTA buffer
50 mM sodium phosphate pH 7.0	3.05 ml 0.5 M Na2HPO4
	1.95 ml 0.5 M NaH2PO4
100 mM NaCl	1 ml 5 M NaCl
1 mM benzamidine	50 μl 1 M benzamidine
5 mM 2-mercaptoethanol	17 μl stock (14.4 M) 2-mercaptoethanol
	MilliQ water to 50 ml