A fastener system for placing screws into bone or tissue structure during a medical procedure is disclosed. In one aspect of the disclosed approach, a preamble sequence is selected from a set of preamble sequences, wherein each preamble sequence is associated with at least one communication mode and the selected preamble sequence is configured to signal a respective communication mode. The rear stud connector includes a rear stud, including a stud blade and a stud base, and a rear stud adapter including an adapter base and an adapter mount. More preferably, a genetic segment of a PTHrP gene includes a VNTR containing region.