Hey,
Strictly speaking you cannot do a "concentration" in Origins Research -- however whether or not you choose a concentration in iSci, you are able to do a Minor in the field.
I've taken 3 of my electives in Origins, and I have found those to be some of my favourite classes. It is really helpful because the administrator for our iSci Program is also the administrator for the Origins Department -- so you can have any of your questions answered.
The reason one cannot do an Origins Research Specialization, is because this specialization requires you to do a Thesis in Origins, whereas iSci requires you to do your Thesis in "iSci" -- with this being said, this does not mean that you can't do your thesis eventually with a professor in the Origins Institute, and have Origins Themes present in your final thesis.