Transgenes encoding mutant proteins were tested for functional complementation with elav alleles: elav^e5 and elav^ts1 w/Y; Tg/balancer were crossed to elav^xw sn/balancer (x denotes the elav allele, Tg stands for the transgene). Rescue (%) = (number of rescued males of genotype elav^x w sn/Y; Tg/+)/(number of control females of genotype elav^xw sn/w; Tg/+) × 100. For details see materials and methods.