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Fibrin-based Bioinks

           Table 3. Bioprinting with fibrin-based bioinks.
           Components                               Bioprinting  Origin  Cells         Outcomes           Ref
           Fibrinogen Cross-linking  Additives
                       agents
           60 mg/ml    Thrombin 50  Furfuril-gelatin   Extrusion-  n/a   iPSC-derived   Printed structures   [89]
                       U/ml        155 mg/ml        based                cardiomyocytes were porous and
                       CaCl2 80    RB                                                  showed good
                       mM                                                              stability
                                                                                       Cells remained
                                                                                       viable, proliferated,
                                                                                       and expressed
                                                                                       cardiac marker
                                                                                       (troponin I)
           30 mg/ml    Thrombin n/a Gelatin 35 mg/ml  Extrusion-  n/a    bladder       Cells maintained   [94]
                                   Hyaluronic acid    based              urothelial cells,  high viability
                                   3 mg/ml                               bladder smooth  for a week after
                                                                         muscle cells  printing, actively
                                                                                       proliferated and
                                                                                       expressed specific
                                                                                       biomarkers
           50 mg/ml    NaCl 150    Hyaluronic acid    Extrusion-  Bovine  primary      Cells were viable   [36]
                       mM          4 mg/ml          based                Schwann cells  and proliferated
                       CaCl2 5 mM  Factor XIII 1 U/ml                                  Directed cell
                       PVA         Aprotinin 0.5                                       alignment was
                       1.4%w/v     mg/ml                                               observed
                       Thrombin 50
                       U/ml
           10 % w/v    Thrombin    Gelatin 5 % w/v  Extrusion-   Bovine  HUVECs,       EC-MSC distance    [93]
                       100 U                        based                MSCs          defining cell-cell
                                                                                       communication
                                                                                       regulates
                                                                                       angiogenesis
           20 mg/ml    Thrombin 50  Gelatin 30 mg/ml  Extrusion-  n/a    neonatal rat   Bioprinted        [90]
                       U/ml                         based                ventricular   constructs
                                   Aprotinin                             cardiomyocytes contracted,
                                   20 µg/ml                                            were formed
                                   Hyaluronic acid                                     by aligned and
                                   3 mg/ml Glycerol                                    electromechanically
                                   10%                                                 coupled cells and
                                                                                       responsive to drugs
           20 mg/ml    Thrombin    Gelatin          Extrusion-   Bovine  primary       Heat-treated       [95]
                       2000 U/ml   7.5 % w/v        based, rotary        neonatal      gelatin increased
                                                                         human dermal   fibrinogen-based
                                                                         fibroblast    bioink printability
                                                                                       Tensile mechanical
                                                                                       properties of
                                                                                       printed constructs
                                                                                       induced the rise in
                                                                                       circumferential and
                                                                                       axial elastic moduli

                                                                                                       (Contd...)


           34                          International Journal of Bioprinting (2020)–Volume 6, Issue 3
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