Inside find a hidden door to enter the secret area. Find a sardaukar assassin hiding here and offer to help him.
Find two guards with halves of a key, kill them and take the key halves to the assassin. Now find two vials to store the samples. The vials are in hidden rooms, one is in the western training room and one in the eastern room.
Next head south and kill the Tleilaxu Master and pick up the note he drops. Unlock the door and enter.
Kill the shadow dancer (read the note first). Get the samples from the freezer, put them in the vials and give them to the assassin.
2e, 2s, enter, 3s, open door, door, s, 4w, s, w,
kill guard (half of key), 4w (should be dirt on the floor),
open trapdoor, kill scientist, open closet, take vial, up
max e, s, max e, n, e, kill guard (half of key), max e
n, exa wall, push button, kill scientist, open closet,
take vial, out, s, max w, s, 4w (should be hole in room desc)
search hole, give key to assassin, give key to assassin,
(wait until he forges it), out, max s, kill master, take note from corpse
unlock door, open door, door, read note, say (whats on the note)
kill dancer, freezer, take sample x2, store sample in vial x2
out, door, max n, search hole, give vial to assassin x2