02br 02br 00"be of + adjective"00 Actually, the structure you have here is basically 'be of + 01b 00noun02b 00', ie01i 00 be of . . 02br 02br 00And the whole sentence is this, "Heat-shock 01font 00proteins are of potential interest02font 00 to cancer researchers"02font 02br 02br 00It's a way of connecting two nouns, where the lsecond is a component of or in some way describes the first.
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