Personal communication from: Amy Beaton, Berkeley Drosophila Genome Project
To: Bloomington Drosophila Stock Center
Subject: y+ variegation in CyO-vWb is background dependent
Dated: 5 August 1998
Information communicated:
The degree of variegation of y+t7.7 in CyO-vWb is background dependent. In most BDGP insertion lines carrying this balancer, 
y+ expression can be detected only in a few macrochaetae and in the presutural, super alar or post alar bristles. Some lines, 
however, have much more extensive y+ expression in adults.