how to interpret NA in the mod_rate column

[lyj95618]

Hi,

I have three replicates of treated and WT for comparison. In the final result table, I see that in some sites, only one of the replicates has a mod rate reported while the other two have NA in the mod rate column. I am wondering how should I interpret the NA value here. Does that mean there is no modification for those two replicates in this site or xpore just didn't detect anything at this site?

Thanks for the help!
Laur