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Gene Wolfe's the Fifth Head of Cerberus is mentioned as a work influenced by the discussion of cloning in the later 1960s and early 1970s in Clone by Gina Kolata (William & Morrow, 1998) on page 114. A plot summary is offered and the work is related to the fears and hopes people have about cloning.
That's interesting. Does it mention LeGuin's "Nine Lives?" A very different take.
-alga-