thanks for all the replies; I don't know if it makes a difference, but I was a research assistant in a Business Consulting office (not a teaching assistant)
It's still a skilled job and still not on the list of 38 so it will give you the basis to apply as a skilled worker but you still need a category. If you have no job offer and haven't been in Canada for 12 months immediately before you apply, you need a 1 year continuous experience in a job on the 38 list.