The microscope is an essential tool for Michal Gavish, a former research chemist who now specializes in “Nano Portraiture,” the title of her show at the BlackRock Center for the Arts. The D.C. artist renders DNA sequences and protein samples in large 3-D constructions, which are echoed by smaller paintings of the same or a similar subject.

The red blotches depict protein in a piece that layers two compositions on diaphanous fabric atop another on paper. Another assemblage positions dabs of blue, red and green — representing DNA — on ribbons of paper, plastic and tissue tied in a bowlike helix. DNA is also the crux of “Fine Mess,” whose bars of color are painted horizontally on long strips of paper that hang nearly from ceiling to floor. Gavish gives tiny things an outsized presence.

It all started when…

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