Stock Photo - Laboratory manager of the in-vitro laboratory of the Agricultural-Horticultural Faculty of the Humboldt University holds a small glass tube with a Liqidamber culture in Berlin, Germany, 12 August 2013. Heat, sickneses and pests make life hard for trees in Berlin. Scientists of Humboldt University have been looking for more robust tree species and have already found some. Photo: MATTHIAS BALK | usage worldwide. - Berlin/Berlin/Germany

Stock Photo: Laboratory manager of the in-vitro laboratory of the Agricultural-Horticultural Faculty of the Humboldt University holds a small glass tube with a Liqidamber.

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