Ubiquitous Hamp knockouts.
The strategy for generating Hamp-knockout mice is outlined in Fig. S5. Briefly, a targeting vector was designed to introduce a floxed Hamp allele into mouse ES cells, with exons 2 and 3, which encode the majority of the peptide, flanked by LoxP sites. Further breeding with a C57BL/6 Flp recombinase deleter mouse allowed removal of the Neomycin resistance cassette. Heterozygous Hamp knockouts were generated by crossing floxed Hamp animals with Pgk1-Cre transgenic mice. Hamp−/− animals and Hamp+/+ littermate controls were obtained from Hamp+/− crossings.