i don't know why.
it just does.
such is life.
and i guess it's not a complaint, just an observation.
zombies make life more interesting, anyway.
so today in immunology we were talking about ABO blood group.
berestecky asked us how would a person with type A blood already have B antigens if they've never had B blood exposure?
and i remembered we talked about how we could have sheep red blood cell antigens if we've had contact with a sheep- like on a farm or at a market or at dinner.
so i asked if i was thinking in the right direction...
and berestecky says not quite right...
and joe, who sits next to me, turns around in his chair and said
"when was the last time you ate a person?"
ahahahaaaaa.... forgot that one detail....
and in case you're wondering, i learned that it's from a genetic mimicry of bacteria in the gut.
a bacteria can look like a B antigen and an antibody is made.
there can be A antigen look alikes, too, but we have "tolerance" and don't delete our own blood.