They scrubbed their hands and forearms at a sink near Mariela's incubator, well-practiced in the hygiene practices of the unit after arriving from Salinas, where Mariela had been born several days earlier.

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Her ribs protrude from her chest, and her tiny forearms are only about as thick as Dr. Edenburg's thumb.

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She spotted Mr. Welch's Marine Corps pin and the dozen rifle-and-helmet memorial tattoos on his forearms, each bearing the surname of a fallen friend.

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