Fig. 4.

The content of total lipids (A) and PCs (B) relative to proteins determined by peak height ratios of 1303 cm⁻¹ to 1003 cm⁻¹ and 720 cm⁻¹ to 1003 cm⁻¹. C) The degree of unsaturation in lipids determined by the ratio of n(–C = C-)/n(CH₂), i.e. peak height ratio of 1657 cm⁻¹ to 1447 cm⁻¹. * p<0.01, N.S.: not significant.