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Take a Revolutionary Approach to Deep Image

Dr. Atsushi Miyawaki et al. developed a water-based optical clearing reagent, Scale, which clears fixed biological samples withoutquenchingfluorescent protein. Using SCALEVIEW-A2, bodily tissues can be cleared of their opacity to provide a clearly defined image. The SCALEVIEW approach integrates seamlessly with multiphoton microscopes, providing the power to visualise 3-dimensional structures at unprecedented depths in morphologically intact tissue.
Optical characteristic : Refractive index ne(20℃) of SCALEVIEW-A2 is 1.377 – 1.381.

1. Link

2. Protocol

Example: Rendering mouse brain tissue transparent for deep imaging according to reference1).


Transcardially perfuse an anesthetised mouse with 4% paraformaldehyde (PFA)/PBS(pH 7.5~8.0).


Remove the whole brain and subject it to post-fixation in 4% PFA/PBS at 4 °C for 10 hrs and cryo-protection in 20% sucrose/PBS at 4 ℃ for 24 hrs.


Embed the sample in OCT compound and freeze it with liquid nitrogen.


Thaw and rinse the sample in PBS, and fix it again with 4% PFA/PBS for 20 min at room temperature.


Clear the sample by incubation in SCALEVIEW-A2 at room temperature.

More than 30 ml of  SCALEVIEW-A2 is required for an adult mouse brain.

A full week of incubation may be necessary for transparency.

During incubation, stir slowly using an orbital shaker.

Exchanging SCALEVIEW-A2 each day accelerates the transparency process.

The sample might be expanded 10-30% in one direction after incubation

Perform deep imaging of the transparent brain using an appropriate dipping objective lens.Use SCALEVIEW-A2 as the immersion medium.

If necessary, immobilize the sample to the bottom of the imaging vessel with agarose.


The transparent brain can be stored for a long time in SCALEVIEW-A2 at 4 °C.


1.Image of a mouse brain after SCALEVIEW-A2 process

Figure 1
Amouse brain after SCALEVIEW-A2 process
Left: a mouse brain before SCALEVIEW-A2 process
Right: a mouse brain after SCALEVIEW-A2 process


2. Imaging data using SCALEVIEW-A2

Figure 2
Imaging of Thy1-YFP(H Line) mouse brain after SCALEVIEW-A2 process using Multiphoton microscope and Multiphoton dedicated objective :OLYMPUS, model:XLPLN10XSVMP.Bars, 50μm.

3. Imaging data using SCALEVIEW-A2

Figure 3
Deep imaging of Thy1-YFP(H Line) mouse brain after SCALEVIEW-A2 process using Multiphoton microscope and Multiphoton dedicated objective :OLYMPUS, model:XLPLN25XSVMP(NA1.0 WD4mm)


Figure 4
Image of mouse pancreas(labeling process the blood vessel using Lectin Texas Red) after SCALEVIEW-A2 process using Confocal microscope  and objective :OLYMPUS, UPLSAPO30XS.


1) Hama, al. : Nature Neuroscience 14, 1481(2011).


4. Product List

Product Name Pkg. Size Wako Cat. No. Storage Condition


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