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Malyhon

гæ (СÓÐÃûÆø)

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Another issue that needs to be explained is that the PHBVPEGMAL
surface (Figure 3c) does not suppress the cell growth
significantly as we expected because of the presence of PEG if comparedwithPHBV-
NH2 and PHBV-RGDsurfaces (Figure 3a,d). The
reason is likely to be the reactive maleimide groups at the end of PEG.
The maleimide group reacts specifically with sulfhydryl groups when
the pHof the reaction mixture is between pH 6.5 and 7.5 and forms a
stable thioether linkage. Because sulfhydryls are present in most
proteins and the cell culturemedium containsmany proteins, it is very
possible that the proteins in the culturemedium are chemically bound
to the end of PEG by maleimide groups, further promoting cell
adhesion and proliferation.

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