Microscopy

Micrographs were captured from a Nikon (Melville, NY, USA) or Olympus (Center Valley, PA, USA) spinning disk confocal microscope, an Olympus Fluoview scanning laser confocal microscope, a Leica Stereoscope (Buffalo Grove, IL, USA), or Leica DMR microscope. Adobe Photoshop (Adobe Systems, Inc., San Jose, CA, USA) and FIJI (National Institutes of Health, Bethesda, MD, USA) were used to process images. Any modifications to the brightness or contrast of images were performed uniformly across the image, in accordance with journal policies.