Figure 4.
Eosinophils from the lungs of cotton rats are functional. Purified cotton rat eosinophils stimulated with the calcium ionophore A23187. Eosinophil peroxidase activity detected by using O-phenylenediamine and measured by using optical density at 492 nm. Range of linearity for eosinophil peroxidase activity compared with numbers of eosinophils per well was similar between cotton rat eosinophils and published data for human eosinophils 36. Each data point represents a mean of at least 3 samples; error bars, 1 SD.