Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Biodistribution & persistence
Rat: low brain and spinal cord levels (tissue/blood <0.1); no blood-brain barrier penetration
“Concentrations in the brain and spinal cord were low throughout with tissue/blood ratios of <0.1, indicating that test material-related radioactivity had not penetrated the blood-brain barrier.”