FURIN and neoplasm: FURIN-005 lacks all of P_proprotein and part of Peptidase_S8, whereas FURIN-003 lacks all of P_proprotein and Peptidase_S8, and part of S8_pro-domain (Figure 6C), demonstrating the functional roles for these isoforms for FURIN-001, FURIN-201 and FURIN-202 in tumorigenesis and SARS-CoV-2 entry into different tumor tissues, particularly FURIN-201.