Lost on the way to Westminster?

I’m grateful to His Grace for pointing me in the direction of this interesting table.

The voting patterns of the The Human Fertilisation and Embryology Bill – Commons vote breakdown were:

Dodds, Donaldson, Mc Crea and Paisley voted "against" but where were the other 5 Dupers?
(Yes I know Lady Hermon was also absent, but considering how much public importance the DUP place on such "social issues", you'd have thought it would have been a full turnout on their part).