A bioinformatics algorithm uses the pseudocode function SUBSTR(start, length, text) to extract a sequence of bases of a specified length starting at the 1-indexed position start.
For example, SUBSTR(4, 3, 'CHROMOSOME') returns 'OMO'.
An analyst executes the following assignment statement:
codon ← SUBSTR(6, 4, sequence)
Below are four variables currently active in memory:
organism ← 'Escherichia'
enzyme ← 'Polymerase'
sequence ← 'METHIONINE'
gene ← 'LACZ'
What is the value of codon after the assignment statement is executed?
’HION’\text{'HION'}’HION’
’NINE’\text{'NINE'}’NINE’
’ONIN’\text{'ONIN'}’ONIN’
’IONI’\text{'IONI'}’IONI’