Events are then set into motion that pit Deckard's search for the replicants against their search for Tyrell to force him to extend their lives. Roy and Leon investigate a replicant eye-manufacturing laboratory and learn of J.F. Sebastian (William Sanderson), a gifted genetic designer who works closely with Tyrell. Rachael visits Deckard at his apartment to prove her humanity by showing him a family photo, but after Deckard reveals that her memories are implants from Tyrell's niece, she leaves his apartment in tears. Meanwhile, Pris locates Sebastian and manipulates him to gain his trust.