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1. A door system for a vehicle comprising a vehicle body structure and a first door structure, wherein the vehicle body structure comprises an opening to an interior compartment of the vehicle, wherein the first door structure has an open position and a closed position relative to the opening, wherein the first door structure in the closed position is arranged to cover at least a portion of the opening, and wherein the first door structure in the open position is arranged at a distance from the closed position in a longitudinal direction of the vehicle body structure, wherein the first door structure comprises a first door beam arranged to extend between a lower part of the vehicle body structure and an upper part of the vehicle body structure when the first door structure is arranged in a closed position, wherein the first door beam comprises a first engaging part arranged at a lower end of the first door beam, wherein the first engaging part is arranged to interact with an essentially correspondingly shaped first receiving guide rail arranged in the vehicle body structure when the first door structure is in the closed position, wherein the first receiving guide rail has an extension in a lateral direction of the vehicle body structure, wherein the extension of the first guide rail is aligned with an extension of a first cross member of the vehicle body structure extending in a lateral direction of the vehicle body structure, wherein, upon a side collision, the first door beam is arranged to engage with the first cross member and the receiving guide rail is arranged to prevent the first engaging part from moving in a vertical direction.
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