Abstract: An insert for cell cultures has a hollow housing (1) of a cylinder-like shape, with an upper, in particular circular, opening (2) and a membrane-like base located opposite the opening (2). On the peripheral opening edge (6) outward protruding support arms (5) are spaced apart from one another. The housing (1) has on its outer peripheral surface (12), between at least two support arms (5), a flattened region (11) extending from the opening edge (6) in the direction of the base (3), so that in a plane perpendicular to the central longitudinal axis (Y) of the housing (1) in the region of the flattened region (11) there is a radial clearance of the peripheral surface (12) relative to the longitudinal axis (Y) which is smaller than the radial clearance and/or outer radius of the peripheral surface (12) in the non-flattened region of the peripheral surface (12).

Abstract: An insert for cell cultures has a hollow housing (1) of a cylinder-like shape, with an upper, in particular circular, opening (2) and a membrane-like base located opposite the opening (2). On the peripheral opening edge (6) outward protruding support arms (5) are spaced apart from one another. The housing (1) has on its outer peripheral surface (12), between at least two support arms (5), a flattened region (11) extending from the opening edge (6) in the direction of the base (3), so that in a plane perpendicular to the central longitudinal axis (Y) of the housing (1) in the region of the flattened region (11) there is a radial clearance of the peripheral surface (12) relative to the longitudinal axis (Y) which is smaller than the radial clearance and/or outer radius of the peripheral surface (12) in the non-flattened region of the peripheral surface (12).