Abstract: The invention relates to a cell culture carrier comprising a first channel and a reservoir, where the first channel and the reservoir are formed in the interior of the cell culture carrier, where the first channel has an inlet opening in an outer side of the cell culture carrier and an outlet opening in the outer side of the cell culture carrier, where the reservoir has at least two openings arranged next to one another, where the first channel is connected to the reservoir by the at least two openings, and where the reservoir is connected to the outer side of the cell culture carrier by no other channel.

Abstract: The invention relates to a mctliod for bio-printing a thrcc-dimensional biological structure containing liv ing cells having at least two different materials for the bio-printing. Said method is distinguished by the fact that, in at least one step, one of the materials for printing is applied or introduced by printing droplets (drop-on-dentand) printing. In particular, this method is suitable for printing tissue structures. including those which have supply structures. Such structures are in particular cardiac structures, liver structures, kidney structures, alveolar structures, skin struchircs or neural structuies. The invention further relates to a biological three-dimensional structure thus obtainable.

Abstract: A process for bioprinting wherein a matrix comprising a modified primary hydroxyl groups containing polysaccharide comprising repeating disaccharide units wherein in at least part of the disaccharide units the primary hydroxyl group is replaced by functional groups selected from carboxyl groups, halide groups or groups comprising sulfur or phosphorus atoms, like e.g. sulfate groups, sulfonate groups, phosphonate groups and phosphate groups, is used and bioink formulations.

Abstract: In a first aspect, the present application relates to a method for producing a tissue model comprising supply structures. In a further aspect, the application relates to tissue models that can he obtained in this way and to the use of said tissue models as models for tissue genesis, in particular tumorigenesis, including angiogenesis, in the tissue model. Finally, a method for testing and identifying active ingredient candidates, including treatment strategies, is provided.