Table 1. Spectroscopic and EPR Spin parameters for azurin, rusticyanin and AcoP.

	UV-Visible spectroscopy			CD spectroscopy	EPR spectroscopy
	S(Cys)→Cu σ charge transfer transition	S(Cys)→Cu π charge transfer transition	RL (≈450 nm/≈600 nm)	CD extrema bands	g values	A values [×10−4 cm−1]
				390(+) nm	gx = 2.032	ACu x = 7
azurin	-	627 nm	0.08	460(−) nm	gy = 2.056	ACu y = 7
				640(+) nm	gz = 2.259	ACu z = 58
				402(+) nm	gx = 2.020	ACu x = 64
rusticyanin	450 nm	597 nm	0.4	471(−) nm	gy = 2.062	ACu y = 9
				577(+) nm	gz = 2.217	ACu z = 56
				400(+) nm	gx = 2.019	ACu x = 65
AcoP	438 nm	568 nm	1.3	460(−) nm	gy = 2.057	ACu y = 12
				565(+) nm	gz = 2.193	ACu z = 66