有谁知道Nature的免费密码？速要！

有谁能帮我查以下几篇文献全文，小女子不甚感激：
1 Stuart GJ, B Sakmann (1994) Active propagation of somatic action potentials into neocortical pyramidal cell dendrites. Nature 367:69-72

2 Ludwig M, Sabatier N, Bull PM, Landgraf R, Dayanithi G, Leng G (2002) Intracellular calcium stores regulate activity-dependent neuropeptide release from dendrites. Nature 418: 85-89.

3 Di Monte DA (2003) The environment and Parkinson's disease: is the nigrostriatal system preferentially targeted by neurotoxins? Lancet Neurology 2: 531-538.

4 Rietze RL, Valcanis H, Brooker GF, Thomas T, Voss AK, Bartlett PF (2001) Purification of a pluripotent neural stem cell from the adult mouse brain. Nature 412: 736-739.

5 Bylund M, Andersson E, Novitch BG, Muhr J (2003) Vertebrate neurogenesis is counteracted by Sox1-3 activity. Nature Neuroscience 6: 1162-1168.

6 Miyazawa A., Fujiyoshi Y, Unwin N (2003) Structure and gating mechanism of the acetylcholine receptor pore. Nature 423: 949-955.

7 Kash TL, Jenkins A, Kelley JC, Trudell JR, Harrison NL. (2003) Coupling of agonist binding to channel gating in the GABA(A) receptor. Nature 421: 272-275.

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nature可以免费注册得，并且可以看一小部分原文。
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