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Telomer jest to fragment chromosomu zlokalizowany na jego końcu, który zabezpiecza go przed uszkodzeniem podczas kopiowania. Telomery są także czynnikami kontrolującymi liczbę podziałów komórkowych i dlatego uważane są za supresory transformacji nowotworowej, ponieważ ograniczona, ściśle kontrolowana liczba podziałów zapobiega ewentualnemu kumulowaniu się mutacji w komórce. Przyjęto, że obecność 4-6...
Expansins are extracellular proteins which are able to loosen cell walls thus making possible the extension and stress relaxation of plant walls. Expansins are classified on the basis of sequence similarities and substrate specificity into two subfamilies of a- and b-expansins. The expansins? mode of action is based on the weakening of hydrogen bonds between cellulose microfibrils and on interacting...
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