Clinical Sciences Question of the day

A flock of sheep has been grazing on Sorghum halepense (Johnson grass), Tetradymia spp. (horsebrush), and Artemisia nova (black sage).

Many of the exposed animals have edema, especially in their heads. This lamb has edema around the eyes, and the ears are hyperkeratinized.

What is the photosensitizing agent responsible for this condition?

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