title: Naloxone influences ultrasonic calling in young mice.
abstract: The ultrasonic calls produced by three day old mice when separated from the nest mother and siblings increase in number when naloxone is injected.
authors.affiliation: Dept. of Biology, Open University, Milton Keynes, MK7 6AA, U.K.
authors.forename: D J
authors.initials: DJ
authors.lastname: Robinson
authors.affiliation: Istituto di Psicobiologia a Psicofarmacologia, via Reno 1, Rome, Italy.
authors.forename: B
authors.initials: B
authors.lastname: D'Udine
authors.affiliation: Istituto di Psicobiologia a Psicofarmacologia, via Reno 1, Rome, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Olivero