β-Sitosterol-loaded leciplexes attenuate rheumatoid arthritis in rats by modulating JAK2/STAT3, NF-κB, and p38 MAPK signaling pathways. - Mady FM; Alsalhi A; Zaki RM; Nafady MM; Aboud HM; Zayan AZ; Darwish MA; Hussein AK (Naunyn-Schmiedeberg's archives of pharmacology, 2026)