Full necropsies were performed on all fetuses. Representative peripheral tissues, included in Supplemental Table
S1, were collected and fixed in 10% neutral buffered formalin. Before removal from the cranium, the brain was flushed with normal saline followed by 4% paraformaldehyde (PFA), and then immersion-fixed in 4% PFA. Tissues were processed routinely, embedded in paraffin, sectioned at 4 µm (peripheral) or 5 µm (brain), and stained with hematoxylin and eosin for analysis by light microscopy. All peripheral fetal tissues were examined by ONPRC veterinary pathologists. Photomicroscopy was performed with a Leica
DMC2900 camera and Leica LAS X microscopic imaging software. Slides were scanned using a Leica Aperio AT2 slide scanner. Histologic sections of the brain underwent routine histological examination by two neuropathologists (M.H.H. and M.R.G) blinded to exposure and outcomes.
Ryan K.S., Karpf J.A., Chan C.N., Hagen O.L., McFarland T.J., Urian J.W., Wang X., Boniface E.R., Hakar M.H., Terrobias J.J., Graham J.A., Passmore S., Grant K.A., Sullivan E.L., Grafe M.R., Saugstad J.A., Kroenke C.D, & Lo J.O. (2024). Prenatal delta-9-tetrahydrocannabinol exposure alters fetal neurodevelopment in rhesus macaques. Scientific Reports, 14, 5808.