myo5b mutant cardiomyocytes have increased recycling endosomes. A: Electron microscopic images of 36 hpf sibling and uq23ks mutant cardiomyocytes showing nonmitochondrial vesicles and tubular structures (blue arrows). M, mitochondria; Scale bar?=?2.5??m. B: Graph quantifying vesicles and tubular structures in siblings vs. mutant cardiomyocytes within 1??m of the plasma membrane; mean?±?SEM. C: Confocal imaging of recycling endosomes (labeled with RFP?Rab11a) in sibling and mutant cardiomyocytes at 48 hpf. Cardiomyocyte membranes demarcated with white outline. D: Dot plot of the number of recycling endosomes per cell (as determined by RFP?Rab11a?postive particles), showing significantly more recycling endosomes in cardiomyocytes of uq23ks mutants vs. siblings. E: Histograms of recycling endosome size, showing significantly larger endosome size, consistent with endosome fusion.
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