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(A) Predominant repetitive modular sequences in certain most common EXTs with isodityrosine (YVY) and other crosslinking sites (VYxK) as well as the Ser-(Hyp)4, which is O-glycosylated. (B) O-glycans present in the Ser-(Hyp)4 motif. In addition, the glycosyltransferases that transfer specific sugars on the EXT backbone are indicated in the figure.
