Greeting All.

My post is about procedure of how to pre-process exome sequence files before variant calling.

I used bwa and bowtie each for increasing accuracy of my results and reducing false positives.

And then, next major steps are read duplicate removal, indel realignment and base quality score recalibration.

However, before stepping to read duplicate removal process, I heard that there is another minor step called 'AddOrReplaceReadGroup'.

Is it okay to ignore this minor preprocess? Or, ignoring this step will be resulting different variations?

I think that preprocessing is very important in detecting variants accurately. Therefore I ask a post in this forum.