Contact: Marnie Halpern
Caption: The upper image is a three-day-old zebrafish larva showing activation of green fluorescent protein expression in the liver (arrow) following exposure to an estrogenic compound. An unexpected response was also found in the developing heart valves (bottom images, arrows), show in their open (left) and closed (right) states.
Credit: Daniel Gorelick
Usage Restrictions: With permission
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