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open my $fh_in , '<', 'test1.txt' or die "Can not open file test1.txt:
+ $!";
...
}
close $fh_out;
close $fh_in;

MGI:1918918                    381629                         0610007C
+21Rik             5            syntenic            51374             
+             C2orf28                   2p23.3                    B
MGI:1918917                    71667                          0610007L
+01Rik             5            syntenic F          55069             
+             C7orf42                   7q11.21                   C
MGI:1923501                    76251                          0610007P
+08Rik             13           syntenic B3         375748            
+             C9orf102                  9q22.32                   M
MGI:1915571                    58520                          0610007P
+14Rik             12           syntenic            11161             
+             C14orf1                   14q24.3                   B