Drosophila wing imaginal disc showing expression of apterous (red), wingless (blue, and Delta (green). (Bio-Rad confocal system)
Surprisingly, though, nearly 400 years of development have resulted in only about a threefold increase in the magnifying power of the light microscope. There is no theoretical limit to the level of magnification achievable with an instrument, but at higher magnifications light waves coming from different parts of the sample interfere, making it difficult to resolve points close together. For a standard,...
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