Fig. 5. Immunohistochemical staining of type I collagen in neo-tissues in the 4th to 20th week after poly-d, l-lactic acid filler injections. (A) 4th week; (B) 8th week; (C) 12th week; and (D) 20th week. Yellow arrows: type I collagen, with increasing number from A to D. This figure has been adapted from ref. 48 with permission from Lin, Copyright 2019.
