From a Generalized 1/4 Tag in which the Very Centers are 
  directly facing an outside dancer.
- Very Centers and directly-facing outside dancers Pass Thru;
 - Center 4 Cast Off 1/4 and Roll and Spread to become Ends of Lines 
    as the Others Cross Concentric Vertical 1/2 Tag;
 - all Counter Rotate 1/4.
 
    
Ends in Parallel Lines.This is a 3-part call.
Notes:
- 
The Cast Off 1/4 can be from either a Mini-Wave or a Couple.
 - 
Be sure to pass Right-shoulders on the Vertical 1/2 Tag.
 
Cross Nuclear Reaction [C3B] (Lee Kopman 1988):
 Same as Nuclear Reaction except that the Very Centers Diagonal Pass Thru 
  with the diagonally-facing outside dancers.
Those doing the Pass Thru (or Diagonal Pass Thru) should point at each other before moving as in 
  Chain Reaction.
anything (Cross) Nuclear Reaction [C3B]:
 Do the anything call leaving off the final Extend, then do a full
  (Cross) Nuclear Reaction.  The anything call is usually a Scoot
  Back variation of a Tagging call.
 See also anything Reaction [C3A].