There is no such substructure observed within isolated electrons.
2.
For that matter, an isolated electron is undetectable too; they have to interact with surrounding matter to be " seen " .-- talk ) 22 : 29, 15 February 2011 ( UTC)
3.
There are no isolated electrons, for example, only fields of force continually ebbing and flowing in a seamless web of activity which manifests events that we choose to call electrons because it suits our analytic purposes.