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$_ =<<SQ;
ATOM   3316  N   TYR D  24      97.479  18.805   2.990  1.00 36.32    
+  D    N
...
STDOUT:
ATOM   3316  N   TYR X  24      97.479  18.805   2.990  1.00 36.32    
+  X    N
ATOM   3322  CD1 TYR D  24      96.225  15.974   2.812  1.00 17.96    
+  D    C

$_ =<<SQ;
ATOM   3316  N   TYR D  24      97.479  18.805   2.990  1.00 36.32    
+  D    N
...
STDOUT:
ATOM   3316  N   TYR X  24      97.479  18.805   2.990  1.00 36.32    
+  X    N
ATOM   3322  CD1 TYR D  24      96.225  15.974   2.812  1.00 17.96    
+  X    C