- Mapping of a human fibrillar collagen gene, pro alpha 1 (XI) (COL11A1), to the p21 region of chromosome 1. Henry, I., Bernheim, A., Bernard, M., van der Rest, M., Kimura, T., Jeanpierre, C., Barichard, F., Berger, R., Olsen, B.R., Ramirez, F. Genomics (1988)