Frameshift deletion of bases 4:954673 and 4:954674 resulting in the addition of RRLSYNKPLKYSKSCTP after cysteine 563 of all 4E-T isoforms and premature truncation after these novel amino acids.
Deletion of bases 4:954673..954674 in 4E-T results in a frameshift and early translation termination after the additon of 17 novel amino acids (RRLSYNKPLKYSKSCTP).