NFIB is a symbol for the gene, Nuclear factor I/B, in humans. Other names include: Nuclear factor 1 B-type; NF1-B; Nuclear factor 1/B; NF-I/B; NFI-B; CTF; HMGIC/NFIB; NFI-RED; NFIB2; NFIB3. The encoded protein has an amino acid length of 420 and a mass of 47.4 kDa. Other isoforms may exist. NFIB is a member of the CTF/NF-I family. This gene shares homology with other species, including: Frog.