I want to know if I can use a particular type of formatting to differentiate one part of the figure from the text. For example, in the figure below, I would like to talk only about the role of part M5 in the system and would like to box it or bold it as I pause to explain one bullet of the slide. Subsequently, another part of the image would be boxed and so on.

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It is hoped that the question is not a duplicate because the image is not created in Latex. So, I need to know how "remember picture" can help in this case. – envy_intelligence Jan 23 '15 at 05:39
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2You have an external image that you want to draw on. This is covered in Drawing on an image with TikZ. – Werner Jan 23 '15 at 06:01