Table 4. Summary of relations among fluorophores, cellular or metabolic functions, and expected versus measured fluorescence signals and lifetimes at emission wavelengths.

Biochemical fluorophores in prostate tissue	Relations to cellular/metabolic functions of tissue	Fluorescence expected (spectral band; peaks) in nm [ 28 ]	Fluorescence measured [see Fig. 4(a) ] (τ: lifetime in ns)
			Peak	τ; cancer	τ; benign
Porphyrins	Tissue vasculature	> 600; 630, 680	632 nm 684 nm	2.59 ± 0.49 2.17 ± 0.40	2.22 ± 0.45 1.85 ± 0.32
Flavins	cellular metabolism	500-600; 550	532 nm 562 nm	3.12 ± 0.44 3.03 ± 0.48	2.72 ± 0.37 2.63 ± 0.38
Lipopigments	cellular disposal process	450-670; 560	532 nm 562 nm 632 nm	3.12 ± 0.44 3.03 ± 0.48 2.59 ± 0.49	2.72 ± 0.37 2.63 ± 0.38 2.22 ± 0.45