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Greetings,
	Rosemary White wrote:

>
>And all DNA stains (the ones I've ever used, anyway) also stain the 
>cell walls, of course.
>
  	This is my experience too. But does anyone know why? Is it 
simply the negative charges in phosphates and sugar acids being 
alike? But dyes like propidium idodide (PI) for example are 
supposedly DNA intercalators, and I envisoned this as being steric 
rather than ionic. PI is a great cell wall stain. Anyone know why??

	Thanks,
		Tobias
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