Hey guys, I've got a developmental question for yall. How would you experimentally compare gene expression during gastrulation in birds with that in frogs? I've been racking my brain trying to think of this, and the only way I can think of is to use a microarray, since it allows you to look at so many different genes. However, I'm not sure if this is useful for comparing gene expression in two different animals. Can you use this method? Is there some sort of recombination/transplantation/knockout experiment you could use? Thanks.