A synthetic peptide corresponding to amino acids 1-32 from the N-terminal of the human SP-C proprotein coupled to KLH. Molecular Weight 21 kDa proprotein as well as processing intermediates of M.W. 26 kDa, 21 kDa, 16 kDa and 14 kDa.

Surfactant protein C (SP-C) is synthesized by alveolar type II cells as a 21-kDa propeptide (proSP-C 21) which is proteolytically processed in subcellular compartments distal to the trans-Golgi network to yield a 35-residue mature form.