Abstract
We demonstrated the ultrastructure of rat glomerular basement membrane (GBM) by ultra-high resolution scanning electron microscopy. GBM prepared by sonication methods and conductive-staining could be observed without metal coating at magnifications as high as 400,000 times. The GBM showed an irregular meshwork structure composed of various strands and pores. The width of the strands ranged from 6 to 15 nm, and the diameter of pores ranged from 6 to 50 nm. The present study confirmed our molecular sieve theory of the basement membrane.
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