open (PIR,'file.txt');
while (<PIR>)
{
    chomp;
    if( /^ENTRY/ ) { $entry = $_ }
    elsif ( /^(TITLE)\s+(\S.*)/ ) { $title = "$1\n\t $2" }

    elsif ( /^(ORGANISM)\s+(\S.*)/ ) { $org = "$1\n\t $2" }
    elsif ( /^ACCESSIONS/ ) { $acc = $_ }
    else {
        push @se, $_;
    }

##</code><code>##

ENTRY            CCHU       #type complete
TITLE            cytochrome c [validated] - human
ORGANISM         #formal_name Homo sapiens #common_name man
ACCESSIONS       A31764; A05676; I55192; A00001
MGDVEKGKKIFIMKCSQCHTVEKGGKHKTGPNLHGLFGRKTGQAPGYSYTAANKNKGIIWGEDTLMEYLENPKKYIPGTKMIFVGIKKKEERADLIAYLKKATNE
ENTRY            CCCZ       #type complete
TITLE            cytochrome c - chimpanzee (tentative sequence)
ORGANISM         #formal_name Pan troglodytes #common_name chimpanzee
ACCESSIONS       A00002
GDVEKGKKIFIMKCSQCHTVEKGGKHKTGPNLHGLFGRKTGQAPGYSYTAANKNKGIIWGEDTLMEYLENPKKYIPGTKMIFVGIKKKEERADLIAYLKKATNE
ENTRY            CCMQR      #type complete
TITLE            cytochrome c - rhesus macaque (tentative sequence)
ORGANISM         #formal_name Macaca mulatta #common_name rhesus macaque
ACCESSIONS       A00003
GDVEKGKKIFIMKCSQCHTVEKGGKHKTGPNLHGLFGRKTGQAPGYSYTAANKNKGITWGEDTLMEYLENPKKYIPGTKMIFVGIKKKEERADLIAYLKKATNE