FIGURE 5.

Factors generated from eigenvector rotation. Factor 1 describes changes in cellular phospholipids during ATII cell differentiation, and is extremely similar to the cytoplasm spectrum displayed in Fig. 1 (spectrum 1, R₁ = 0.98). Factor 2 describes protein-related differentiation changes, and demonstrated significant correlation with a model protein spectrum generated by least-squares fitting Factor 2 with a basis set of protein spectra (R₂ = 0.98). Factors have been baseline-corrected and normalized to maximum intensity values, and are offset for clarity.