FASLG and retinal detachment: To determine the relative contribution of FasL, mFasL, and sFasL in the death of photoreceptors following retinal detachment, we used two strains of mice that we previously identified as susceptible (BALB/c) and resistant (B6129SF2) to photoreceptor death following an induced retinal detachment.23 BALB/c FasL−/− mice were produced by an eight nucleotide deletion in the FasL gene that results in a splicing error and frameshift mutation (Supplementary Figure 1A and B).