Abstract: The present invention relates to a stem cell and/or a population thereof having a specific profile of cell surface proteins and/or proteoglycans. The present invention also relates to use of a proteolytic enzyme in the modification of the cell surface of a stem cell. The present invention further relates to a method of modifying the cell surface of a stem cell by treatment with a proteolytic enzyme.

Abstract: Bone drill (100) for medical operations. In the bone drill, there is an elongated drill component (101), which is manufactured from a superelastic material, and an essentially straight drill-component shield (103), which is hollow. According to the invention, at the end of the drill-component shield there is a guide arrangement (102) for selecting for the drill component a turning angle (?; ?) relative to the drill-component shield, and once the drill component has run through the guide part, the superelastic properties of its material return it to its original shape and the drill component is then (101) is a position, in which it can be used to drill in the direction of the turning angle (?; ?).