The present invention, there is provided a laboratory animal for positioner 1 for retaining the experimental animals, a predetermined distance in at least one of the left or right from the center line L1, which comprises a body 2 of the plate, passing through the center C of the main body 2 The position I is characterized in that the hind hole 4 having a diameter capable of passing through the knee is provided with at least the hind limb of the experimental animals.
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