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They are home to wolves, elks and tigers: the boreal forests of the north. They store more carbon than all the rainforests put together and, as such, are crucial for the world’s climate. Where permanently frozen ground is mostly covered in metre-high snow, and summer is dominated by drought, conifers and ground-cover plants are accustomed to fire. Some plants even need the flam...。描述著名醫生丹尼斯史萊門研製一種治療乳腺癌的新藥"賀癌平"(Herceptin)的感人過程。HER-2是細胞上的一個生長因子接受體，它可以接受訊息而加速細胞的生長與分裂。一般認為HER-2大量增加，可能會增強癌細胞繁殖能力。史萊門醫師在基因科技公司發展一個對抗HER-2的新藥，這是已經人類化的抗HER-2單株抗體，定名為賀癌平。史萊門從1995年6月到1997年3月收集了469位HER-2高度表現的轉移性乳癌來評估賀癌平和化學治療併用的效果。。