What Word Is Muffled at 1:42 in the Speech Video?

[impo]

http://www.youtube.com/watch?feature=player_embedded&v=8SDKV29NPaEAt minute 1:42, he says: ...depending on their xxxx biology, not the particular symptoms that they have

Could you tell me what is xxxx ? (I can't figure out the word he says). Thank you. (I guess it is "disease" but...)

 

[Borek]

I could tell you what the word is, but instead I suggest you learn how to turn captions on

 

[leroyjenkens]

Captions say "disease", but if he said "disease", that's the strangest way I've ever heard that word pronounced. I really don't think that's the word.

 

[Evo]

Captions say "disease", but if he said "disease", that's the strangest way I've ever heard that word pronounced. I really don't think that's the word.

It's "disease", he tripped on the word when he said it.

 

[phinds]

It's "disease", he tripped on the word when he said it.

I hope he didn't hurt himself. Last time I tripped on a word I flailed around and knocked over an English professor and two graduate students.