This domain is found in a wide variety of contexts, but mostly occurring in cell wall associated proteins. A lack of conserved catalytic residues suggests that it is a binding domain. From context, possible substrates are hyaluronate or fibronectin (personal obs: C Yeats). This is further evidenced by. Possibly the exact substrate is N-acetyl glucosamine. Finding it in the same protein as pfam05089 further supports this proposal. It is found in the C-terminal part of Bacillus sp. gellan lyase, which is removed during maturation. Some of the proteins it is found in are involved in methicillin resistance. The name FIVAR derives from Found In Various Architectures.