ELN and keloid: Other ECM constituents also expressed at higher levels in keloid fibroblasts include fibronectin (Kischer and Hendrix, 1983; Babu et al., 1989; Kischer and Pindur, 1990; Sible et al., 1994; Blume-Peytavi et al., 1997; Chipev and Simon, 2002; Liang et al., 2013; Suarez et al., 2015; Fang et al., 2016; Luo et al., 2017; Hsu et al., 2018), elastin (Russell et al., 1989, 1995; Lee et al., 1991), glycosaminoglycans (Berman and Duncan, 1989; Suarez et al., 2013), and both small and large proteoglycans (Yagi et al., 2013).