Meet Fabio. This is “Big Jess’s” phage from last year. When we took these electron microscopy images of our phages we had purified and amplified that phages so that we would have a pure sample of each new phage. However, not all copies of the same phage will look the same. in A) Fabio is a large T4 style tailed phage (http://en.wikipedia.org/wiki/Caudovirales), of the order caudovirales. in B) this phage Fabio appears to have injected his DNA (observe the contractile tail). His phage head or capsid has collapsed in on itself. Very different looking entity but these images are both of the same bacteriophage.