Bass Help

Hey guys, I have been producing for about two years now and I enjoy all the different types of house music. I’m not the best producer but when I hear a synth line that I like I usually try and emulate it, just to see if I can do it. I don’t like being stumped by certain sounds and that is exactly what has happened to me.

Maybe this one is easy for you guys, but I was hoping that I could get a little help with how this bass line was synthesized.

http://www.youtube.com/watch?v=gf1DopEiqjM

I would really appreciate some help, you guys are awesome!

Thanks again!