Write a perl program


Write a Perl program that given a DNA string, prints out the 20 characters upstream of the start codon ATG. That is, given:

$dna = "CCCCATAGAGATAGAGATAGAGAACCCCGCGCGCTCGCATGGGG";

print out:

The 20 bases upstream of ATG are AGAGAACCCCGCGCGCTCGC

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Computer Engineering: Write a perl program
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