He then asked news organizations to tally up the number of Americans killed through terrorist attacks in the last decade and compare it with the number of Americans who have died in gun violence.
In molecular biology, a reading frame is a way of dividing the sequence of nucleotides in a nucleic acid (DNA or RNA) molecule into a set of consecutive, non-overlapping triplets. Where these triplets equate to amino acids or stop signals during translation, they are called codons.
1 The stretch of codons between AUG and a stop codon is called an open reading frame (ORF). Computer analysis of DNA sequence can predict the existence of genes based on ORFs.  Other amino acids are specified by more than one codon--usually differing at only the third position.