UCSD Cystine Determination Laboratory

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C = normal gene / non-cystinosis gene
c = recessive gene /cystinosis gene

Cc = carrier / heterozygote / no cystinosis
CC = non carrier / no cystinosis
cc = cystinosis

This is the pattern of autosomal recessive inheritance.
Carriers have normal health. If two people who are carriers for the cystinosis gene have a child there is a :