Abstract: The invention provides a Dre/rox recombinase system. In particular, the invention provides Dre polypeptides that can catalyze site-specific recombination at rox sites but not at lox sites. The Dre/rox system can be utilized in a number of genetic manipulations either alone or in combination with other recombinase systems.

Abstract: Methods and systems are provided for determining a characteristic of an in vivo sensor. A transmit field, operative to induce a response signal in an associated in vivo sensor, is generated at a transmitting component having an associated orientation. The response signal is received at a receiving component, having an associated orientation. The coupling between the transmitting component and the receiving component is measured. The associated orientation of at least one of the transmitting component and the receiving component is rotated as to reduce the measured coupling.

Abstract: Systems and methods are provided for determining a characteristic of an associated in vivo sensor within a living body. A transmit coil produces an excitation signal, having a first orientation, to excite the in vivo sensor to produce a response signal. A receive coil produces a current in response to the response signal. The receive coil is oriented to interact with signals having a second orientation that is substantially orthogonal to first orientation. The probe further comprises at least one eddy current compensation coil that produces a compensation field. A component of the compensation field along the second orientation has a magnitude at the receive coil substantially equal and opposite to a magnitude of a similarly oriented component of a magnetic field associated with eddy currents induced within the body.

Abstract: The invention provides a Dre/rox recombinase system. In particular, the invention provides Dre polypeptides that can catalyze site-specific recombination at rox sites but not at lox sites. The Dre/rox system can be utilized in a number of genetic manipulations either alone or in combination with other recombinase systems.

Abstract: The invention provides a Dre/rox recombinase system. In particular, the invention provides Dre polypeptides that can catalyze site-specific recombination at rox sites but not at lox sites. The Dre/rox system can be utilized in a number of genetic manipulations either alone or in combination with other recombinase systems.

Abstract: This relates to an in vitro headful packaging system for cloning foreign DNA fragments as large as 95 kb. Also of concern is a method of cloning and controlling amplification of DNA fragments as large as 95 kb in a vector containing a multicopy replicon under control of a lac promoter as well as vectors useful for cloning foreign fragments of DNA as large as 95 kb and lysogens to prepare pac-cleavage proficient extract and head-tail proficient extract.

Abstract: A method for producing site-specific recombination of DNA in eukaryotic cells at regions designated lox sites is disclosed.