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The scaffolds were observed under a fluorescence stereomicroscope (Leica MZ FL b, Leica Microsystems, Glattbrugg, Switzerland) to assess the regional distribution of the living cells in green (calcein staining) (¼¤·¢²¨³¤480/40 nm, ·¢É䲨³¤ 510 nm) and dead cells in red (PI staining) (¼¤·¢²¨³¤ 546/10 nm, ·¢É䲨³¤590 nm). ÎÒÏëÎÊϺìÉ«µÄÄǸöÊÇʲôÒâ˼£¿ |
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| Calcein AM reacts with intracellular esterase to produce green fluorescence at 490nm while PI enters only dead cells with damaged membranes which produce red fluorescence at 545nm upon binding to nucleic acids |

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