Fluorescence-activated cell sorting analysis of cells isolated from adjuvant-induced arthritis rat synovial tissue. Twenty-four hours after systemic administration of N-(2-hydroxypropyl)methacrylamide copolymer labeled with Alexa Fluor® 488 (P-Alexa), cells were isolated from adjuvant-induced arthritis rat synovial tissue for fluorescence-activated cell sorting (FACS) analysis. IgG1 was used as control for CD68 and prolyl-4-hydroxylase. IgG2a was used as control for CD11c. The result for IgG2a is similar to that for IgG1 with the upper right quadrant detected at 2.45% (data not shown).