The Ptprstm1a(KOMP)Mbp allele (MGI:4840831) was FLP excised by microinjecting 100ng/ul of FLP mRNA (Miltenyi BIotec Inc.Cat# 130-106-769) into the cytoplasm of IVF-derived zygotes. This resulted in the removal of the neo selection cassette and lacZ reporter leaving behind the floxed critical exon(s). See http://www.mousephenotype.org/data/genes/MGI:97815 for more information. (J:200814)