Amounts of PLs (A, % of total PLs) and Chol (B, % of total Chol) in domains uniquely formed due to the presence of membrane proteins in porcine intact cortical (open symbols) and nuclear (filled symbols) lens membranes. Presented data, represented by points, are for eight lenses obtained in July 2014, and twelve lenses obtained in February 2015. Mean values and standard deviations for each group are indicated as solid lines and bars, respectively. Broken lines indicate the interval around mean values outside of which the differences between means are statistically significant with P ≤ 0.05. Results for PLs were obtained based on conventional EPR spectra of 12-SASL (as indicated in Fig. 3) and for Chol based on conventional EPR spectra of ASL (as indicated in Fig. 4).