Unstained bacteriophage T4
A freeze-dried preparation of bacteriophage T4 and TMV. The virus consists
of a head (normally full of double-stranded DNA), a tail tube, a baseplate
at the end of the tail tube and thin tail fibers attached to the base plate.
The particle at the lower right has lost its DNA. The mass per unit length
of a tail fiber is 866 +/- 76 kDa, indicating it is a trimer. The
of the dark-field micrograph is 0.512 microns.