Intensity ratios pool B/pool H for enriched phosphopeptides compared to pool B/ pool H ratios of total peptide intensities in non-bound and in non-enriched pools.

B/H ratios of phosphopeptide intensity in enriched pools for the corresponding protein is indicated in blue. B/H ratios for intensities of peptides not bound to TiO2 are shown in red and ratios for peptides observed in pools with no enrichment are shown in green. For some proteins not a single peptide was detected in non-bound or non-enriched (direct) pools. Proteins with higher ratios of enriched phosphopeptides than non-bound and non-enriched peptides are highlighted.