The present disclosure, according to one embodiment, describes a laboratory vessel for storing and treating a tissue sample comprises a closable opening, and additionally comprises a pipe part which is insertable in the opening of the laboratory vessel, wherein in inserted position, the pipe part seals against the laboratory vessel with its outer circumference and is clampingly displaceable with respect to said laboratory vessel, wherein a pestle is mounted in the laboratory vessel, over which the pipe part can be placed sealingly with its inner circumference. The laboratory vessel also comprises one or more tissue sample treatment agents. The tissue sample and the treatment agents are separated by placing the pipe part over the pestle, which separates a treatment agent region from a sample region.
