Regarding epitopes for BCRs and/or for TCRs, indicate whether each statement below (a-e) is true. (5 pts) If the statement is only true for epitopes for BCRs--write (B) If the statement is only true for epitopes for TCRs--write (T) If the statement is true for epitopes for both BCRs and TCR--write (BT) If the statement is NOT true for either epitopes for BCRs or TCR--write (N) a. epitopes may consist of non-sequential amino acids b. epitopes are often from the interior of an antigen c. epitopes can be present in immunogens d. epitope binding to the antigen receptor obeys the 12/23 rule e. multiple identical epitopes may be present in a single antigen