“…Transplants of primary striatal tissue, i.e. developing striatal cells that have been dissected from the embryonic ganglionic eminences, currently provide the best source of cells to replace degenerating striatal projection neurons both in animal models of Huntington's disease (HD) (Isacson et al ., 1986; Giordano et al ., 1988; Norman et al ., 1988; Sanberg et al ., 1989; Wictorin, 1992; Björklund et al ., 1994; Fricker et al ., 1997b; Kendall et al ., 1998; Watts et al ., 2000) and now in clinical trials (Bachoud‐Lévy et al ., 2000; Rosser et al ., 2002). Experiments transplanting embryonic striatal neurons/neuroblasts to rat models of Huntington's disease show that these striatal transplants provide good numbers of striatal projection neurons (DiFiglia et al ., 1988; Graybiel et al ., 1989; Zhou et al ., 1989; Clarke & Dunnett, 1990; Xu et al ., 1992; Campbell et al ., 1995).…”