Fig. 2. Autoradiogram of an RNAF–DD gel. Lanes 1 and 2 represent RNAF patterns of deletion 1BS-4 and 1BS-19, respectively. One of the fragment bands present in 1BS-4 but missing in 1BS-19 is marked by an arrow. One of the fragment bands present in 1BS-19 but missing in 1BS-4 is marked by a bullet.