Frameshift mutations in exons 9 and 10 of the porphobilinogen deaminase gene produce a crossreacting immunological material (CRIM)-negative form of acute intermittent porphyria
(1) Division of Clinical Chemistry, Vancouver General Hospital, V5Z 1M9 Vancouver, British Columbia, Canada;(2) Department of Pathology, University of British Columbia, V5Z 1M9 Vancouver, British Columbia, Canada