RBBP4 and neuroblastoma: To further investigate the functional interplay of ARMC12 and RBBP4 during the aggressiveness of NB cells, we designed cell-penetrating inhibitory peptides with 23, 24, and 25 amino acids in length, named as RBBP4 binding peptide 23 (RBP23), RBP24, and RBP25 (Fig. 7a), that might potentially block the interaction between ARMC12 and RBBP423.