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Thanks for your reply Nakul. I actually want Google to index both - one for each audience. We had "no follow" on one of the sections until yesterday.  But, now that's been removed, I'm concerned about the duplicate content and titles.

Just keep it brief. Alt text should not be longer than 100 characters. You can follow this link to gain insight on what Google want from you regarding alt tags >>https://support.google.com/webmasters/answer/114016?hl=en