Fig. 2. LBPs can synthesize and degrade cAMP. HPLC analysis of cAMP on phagosomes treated as indicated. Red color indicates high (5 mM) ATP, blue, intermediate ATP conditions and green low ATP conditions (200 µM ATP). The inset shows a calibration of the system with pure cAMP. The absorbance values represent the peak areas of cAMP. SQ, SQ22356.