What does 1V1 exactly mean?

Question

[mschmid]

In the context of sequence alignment: What does 1V1 exactly mean?

For example mentioned in this recent preprint (Pages 2 & 4): https://www.biorxiv.org/content/biorxiv/early/2019/02/26/546630.full.pdf

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Edit: As genomax pointed out this seems to describe the similarity of the sequences.

See for example here: https://europepmc.org/articles/pmc2632924

Answer 1

[GenoMax]

1V1 appears to indicate sequences with <20% similarity. Looks like the term may come from BAliBASE. 1V2 is between 20-40% similarily

[lieven.sterck]