Fig. 9. On some anterior cardiac plexi (ACPs), blister-like protuberances are evident. In some preparations, the ACPs contain multiple blister-like protuberances of the sheath that are densely packed with FLRFamide-immunopositive profiles. In this example, numerous protuberances are present, several of which are indicated with arrows. This image is a brightest pixel projection of 36 optical sections taken at 2.0 µm intervals. Scale bar, 100 µm.