Seeburg, Peter H. Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Max Planck Society;
https://www.liebertpub.com/doi/pdf/10.1089/dna.1983.2.213 (Any fulltext)
https://doi.org/10.1089/dna.1983.2.213 (Any fulltext)
Comb, M., Rosen, H., Seeburg, P. H., Adelman, J. P., & Herbert, E. (1983). Primary structure of the human proenkephalin gene. DNA, 2(3), 213-229. doi:10.1089/dna.1983.2.213.