Version 5.00 has 198 glycoprotein entries. The criteria for inclusion are at least one experimentally verified O-glycosylation site. The terminal sugar linked to serine or threonine is cited when known. The database is non-redundant in the sense that it contains no identical sequences, unless there is conflicting glycosylation data.
Mucins have tandem repeat sequences, which are O-glycosylated.
This result in some redundancy of the O-glycosylation sites. References of O-glycan assignment. END End of entry Format of O-Unique. This non-redundant database contains 53 entries only including mammalian mucin type glycoproteins. It contains 265 O-glycosylation sites.