Level of unacceptance regarding the inclusion of human cells in organs/tissues/cells of human–animal chimeras. *, p < .05, χ2 test; **, p < .01, χ2 test. In our survey, subjects were presented with four choices for each organ (item): “acceptable,” “somewhat acceptable,” “somewhat unacceptable,” and “unacceptable.” The above figure summarizes the results for subjects who responded “somewhat unacceptable” or “unacceptable.”