Table 3. Noncoding Amino Acids Used in This Study.

	name	CAS number	final conc.
AbK	Nε-[(2-(3-methyl- 3H-diazirin-3-yl)ethoxy)carbonyl]-l-lysine	1253643-88-7	0.5 mM
AcK	Nε-acetyl-l-lysine	692-04-6	10 mM
BCNK	Exo-BCN – l-Lysine	1384100-45-1	0.5 mM
CpK	Nε-[[(2-methyl-2-cyclopropene-1-yl) methoxy] carbonyl-l-lysine	1610703-09-7	0.2 mM
PcK	photocaged l-lysine		0.5 mM
TCO*K	axial trans-cyclooct-2-ene-l-lysine	1384100-45-1	0.1 mM