Figure 2From: The clinical utility of molecular diagnostic testing for primary immune deficiency disorders: a case based reviewElectropherogram of the BTK gene in a normal donor (A) and patient (B). A TGTT deletion in exon 16 leads to a frameshift resulting in a premature stop codon in the BTK gene (g.66795_66798delTTGTT, c.1581_1584delTTTG).Back to article page