MR1 and lung carcinoma: In order to verify the key role of MR‐1 for NICD3 in lung cancer metastasis, we attempted to design and screen short peptides (α Spiral peptides) that could inhibit this protein‐protein interaction (PPI) to interrupt this regulatory effect.[51] After preliminary confirmation of the interaction between MR‐1 and NICD3 (Figure S9A, Supporting Information), we truncated MR‐1.