I am just curious to know if I am using silva bacteria aligned database as my reference database, from which position to which position is the region for, say V1-V3, or V3-V6, etc. I know the total column length is 50,000. But do we have something posted somewhere to make sure I get the right region?
Say from position 1 to 13500 is v1to v3, from 13500 to 26900 is v3-v5? Do we have an arbitrary cutoff for that?