if (@fields[2] ne G || A || C || G)

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The syntax and logic are wrong there.    The letter would be in  $fields[0] and that has to be explicitly compared for each letter and you want to use  && instead of  || for a negative comparison.    For example: 

    if ( $fields[0] ne 'G' && $fields[0] ne 'A' && $fields[0] ne 'C' &
+& $fields[0] ne 'G' )

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In reply to Re^4: Structure number by jwkrahn
in thread Structure number by AG87

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