UREdeltaneo Sfpi1<kd/kd> Spi1<tm1.1Dgt> deltaUREneo targeted mutation 1.1, Daniel G Tenen Hypomorph PU.1<kd/kd> (frt-PGKneo-frt----loxp) PU.1-knockdown MGI:3045207 http://identifiers.org/mgd/MGI:3045207 Sfpi1-knockdown