Are comments in templates removed when you parse the email?

Hello

I know that each time an email is sent out that the CM system takes care of setting up inline CSS, but do you guys remove the comments as well? 

With all the nested tables email templates get complicated and I end up with extensive comments to help with organization.  In the past I'v always removed the comments from the copy I upload as my final template, but it would be more convenient if I knew this wasn't necessary.

Thanks for the info
Jules

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