Copper nanoparticles induce early fibrotic changes in the liver via TGF-β/Smad signaling and cause immunosuppressive effects in rats. - Lee, In-Chul; Ko, Je-Won; Park, Sung-Hyeuk; Shin, Na-Rae; Shin, In-Sik; Moon, Changjong; Kim, Sung-Ho; Yun, Won-Kee; Kim, Hyoung-Chin; Kim, Jong-Choon (Nanotoxicology, 2018)