Just saw this on Twitter this morning. First posted on BioRxiv on Dec 10, 2019, so it's been out for a while. Keep in mind this is a pre-print server; articles have not undergone peer-review yet.
A Nanomule Peptide-siRNA Conjugate that Traverses the Intact Blood Brain Barrier and Attenuates Stroke
https://www.biorxiv.org/content/10.1101/871186v1