Fig. 7
From: The LRR receptor Islr2 is required for retinal axon routing at the vertebrate optic chiasm
vasna/vasnb double mutants do not display overt axon guidance defects at the optic chiasm. a Alleles generated by targeted mutagenesis of the vasna locus, using TALEN technology. All alleles are followed by premature stop codons, leading to the translation of a short and functionally inactive protein. Yellow highlights show the genomic DNA target sequence for the engineered nucleases. b vasna alleles generated by targeted mutagenesis display complete loss of Vasna protein in homozygosity. AC: anterior commissure. FP: floor plate. OC: optic chiasm. POC: postoptic commissure. Single optical sections from confocal Z-stacks. Lateral views. Anterior is to the left. Scale bar: 50 μm. c The vasnb sa6027 TILLING allele leads to complete loss of function, as suggested by the absence of Vasnb immunoreactivity. Single optical sections from confocal Z-stacks. Frontal views. Scale bar: 50 μm. d 5 dpf vasna/vasnb double mutant larvae do not display strong axon guidance phenotypes at the optic chiasm. Ventral views of anterogradely-labeled optic nerves at the optic chiasm. Anterior is to the top. Scale bar: 50 μm