[OS X TeX] change color for alert text in beamer?

[Art Werschulz]

Hi.

I am using the beamer class for a presentation.  If I include the line
   \beamerdefaultoverlayspecification{<+-| alert at +>} 
then I will get an automatic pause after each \item in an "itemize" environment, and the most recently-added item will be in red.

How can I change things so that the most recently-added item is in (say) blue?

Thanks.

Art Werschulz
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