TIMP1 and pachyonychia congenita: Whereas plasma from healthy donors contained similar amounts of double-glycosylated (TIMP-1glyc1/1), single- glycosylated (N78 and not N30) (TIMP-1glyc0/1), and nonglycosylated (TIMP-1glyc0/0) TIMP-1, TIMP-1glyc1/1 predominated in plasma from PC patients.