Abstract: The transplantation of donor tissue into the brain is effected by locking the head relative to a stereotaxic unit; penetrating the brain with a first cannula to a predetermined depth to create a transplant site within the brain while the first cannula is fixed by the stereotaxic unit relative to the brain; then feeding a second cannula, which contains donor tissue at its distal end, through the already fixed first cannula so that the distal end of the second cannula comes to rest at the transplant site; and finally withdrawing the first cannula and the second cannula so as to leave the donor tissue at the transplant site.

Abstract: The transplantation of donor tissue into the brain is effected by locking the head relative to a stereotaxic unit; penetrating the brain with a first cannula to a predetermined depth to create a transplant site within the brain while the first cannula is fixed by the stereotaxic unit relative to the brain; then feeding a second cannula, which contains donor tissue at its distal end, through the already fixed first cannula so that the distal end of the second cannula comes to rest at the transplant site; and finally withdrawing the first cannula and the second cannula so as to leave the donor tissue at the transplant site.

Abstract: A highly effective sleep-inducing pharmaceutical composition that causes few, if any, side-effects contains an amino acid and a cation in certain proportions. The amino acid may be tryptophan, cystathionine, or lysine, preferably tryptophan, and most preferably L-tryptophan, and the cation may be calcium, magnesium, manganese, or lithium, preferably calcium or magnesium, and most preferably calcium. The ratio of amino acid to cation is about 0.02:1 to 1.0:1 when the cation is calcium or magnesium, 5:1 to 100:1 when the cation is manganese, and 0.02:1 to 100:1 when the cation is lithium. The pharmaceutical composition may be administered in any conventional manner.