This was in the original script but most references to it were cut because they confused test audiences. There was a sequence were Roy forced Sebastian to show him the cryostorage and body (which he destroys). When it was removed it causes the scene to end abrubtly with Roy walking towards Sebastian. Tyrell does seem to be very interested in the VK machine and asks Deckard several questions about how it works (none of which Deckard answers). His interest is more than academic since he is a type of replicant himself. Maybe the cut scenes will show up in a future (director's cut plus?) release.
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