CD69 and cyclic hematopoiesis: Clone FN50 did not show reactivity with woodchuck PBMC stimulated with ConA or PMA/ionomycin, while clone H1.2F3 produced in hamster against mouse CD69 stained between 22 and 62% of the stimulated lymphocytes from either healthy or WHV-infected animals with CH (Figure 3B; clone H1.2F3; Table 2).