There are disclosed methods and apparatus for attachment and welding of tissue. A use of putrescine for reducing the risk of having an aneuploid pregnancy in a woman with reduced ovarian ODC activity levels. A mirror register, connected to the routing means in the nonmobile network, is used to record a copy of the user profile transferred by the HLR register of the home network of a roaming mobile terminal to the VLR register of the non-home network.