红尾黑鲨脾脏革兰氏染色压片标本（双色角鱼 (Epalzeorhynchus bicolor)）
Photomicrograph of a touch impression of spleen from from a redtail shark (Epalzeorhynchus bicolor) revealing numerous gram-positive cocci. Streptococcus infection was suspected at necropsy. Gram stain; original magnification, 600×.
Courtesy of Dr. Denise Petty.
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