A subplot that was excised from the film was that the clones were genetically modified so that they would be sterile. This provides an explanation for the title of Kathy's favorite song. The children were raised in full knowledge of what would follow. A brief life with no chance of ever having children. When young Kathy hugs the pillow and listens to the song "Never Let Me Go" the novel clarifies that the pillow stands for an imaginary baby.

Film

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