Citation: Rl. Brent et al., Response to Dr. Rosenquist's comments pertaining to the paper by Andaloro et al. ('98) "Dextromethorphan and other N-methyl-D-aspartate receptor antagonists are teratogenic in the avian embryo model" and letters to the editor by Polifka JE and Shepard TH ('98) and Brent RL ('98), TERATOLOGY, 60(2), 1999, pp. 61-62