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A few cell types are thin enough to be viewed directly in a microscope (algae, protozoa, blood, tissue cultures), but most tissues (kidney, liver, brain) are too thick to allow light to be transmitted through them. The tissues can be sliced into very thin sections provided they are first processed to prevent cell damage. The processing involves a series of steps; fixation, dehydration, embedment and subsequ......阅读全文
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