The Oncomine IGH FR1-J Assay is a targeted next-generation sequencing (NGS) assay for detection of somatic hypermutation (SHM) in the variable region of the immunoglobulin heavy chain of B-cell receptors. SHM increases the affinity of the B-cell receptor for antigen, post-VDJ recombination, and is frequently a region of interest in CLL research. Primers have been specifically designed to target framework 1 and joining gene regions of the immunoglobulin heavy chain, resulting in an amplicon ∼300 bp in length.