my ($probeset_id, $origin, $probeseq, $pip, $gc, $affyscore) = split /
+\t/;

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is a list assignment. A hash slice assignment looks like:

@hash{qw(this that the other)} = qw{some value or another);

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Perl reduces RSI - it saves typing

In reply to Re^2: Complex Data Structure by GrandFather
in thread Complex Data Structure by sesemin

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