Bacteriophage plaque with tail shape

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Robert Adolf Brinzer

Could also be a smear caused by liquid on the surface of the agar transporting the phages away from the initial plaque.

Michael J. Benedik

I think the most likely explanation is that the plate was a bit wet and this was the result of a water droplet that move slightly across part of the plate.

Mai Nasreldeen

Thank you for your answer! that makes sense