For GFP, we use an antibody from Invitrogen--they have goat, mouse, and rabbit, at least. Our secondary is Cy2 from Jackson Immuno. You could try to dissect the muscle to see the GFP without an antibody, but it usually bleaches due to exposure to light. Emiliy -- fortune smiles on the brave and spits on the coward --aguirre, wrath of god