11084
In the present study , we directly observed a spherical A beta in an atomic force microscopic study on the morphology of a reconstituted lipid bilayer composed of lipids that were extracted from a detergent - resistant membrane microdomain ( DRM ) fraction of synaptosomes prepared from aged mouse brain .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None