TABLE 4.

Key SMLR Spectral Bands, Feature Importance, and Assignment

Raman shift (cm−1)	Feature importance	Tissue type	Assignment
754	0.65	Muscle	Tryptophan [33]
827	0.50	Fat	Tyrosine [15]
876	0.95/0.83	Muscle/STS	Hydroxyproline, tryptophan [33,34]
943	0.49	Muscle	—
978	0.40	Muscle	Phosphorylated proteins and nucleic acids [15]
1,086	0.98	Muscle	Phenylalanine, phospholipids [17]
1,265	0.75/0.85	Muscle/STS	Amide III (C–N) in protein, =C–H in phospholipids [17]
1,307	0.67/0.67	Muscle/STS	CH2 in lipids [34]
1,405	0.35/0.52	Muscle/STS	CH3 bending in protein [15]
1,440	0.74	Fat	CH2 in lipids [34]
1,552	0.96/0.37	Muscle/STS	Tryptophan [17]
1,643	0.60/1.00	Muscle/STS	Amide I C=O in protein [17], C=C in lipids
1,786	0.67/0.78	Muscle/STS	—