The cryopreserved 8-μm sections on Superfrost Plus microscope slides (Fisher Scientific) as well as the chambered cell culture slides were imaged using laser scanning confocal microscopy via the Leica WLL TCS SP8 Confocal Laser Scanning Microscope (Leica Microsystems) located in the Cell Sciences Imaging Facility (Stanford University, Stanford, CA). The 10× objectives were used (10× HC PL APO, air, N.A. 0.40). Image analysis was performed using Fiji software (ImageJ, NIH). Photoshop was utilized for image intensity analysis using the histogram tool.
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