either the glutamine codon encoded by the single-copy apob gene at nucleotide 6666 is transcribed and translated to produce apob-100 or an rna-editing mechanism substitutes a uracil for cytosine , altering this glutamine codon ( caa ) to a stop codon ( uaa ) , prematurely terminating translation to produce apob-48 .
C0009221
codon
C0242611
stop codon