John,
>Is shof (shut off) = esg ?
Michael
Yes.  Gary Hime says '...I am now convinced that shof is a specific allele
of esg.  Most of the P alleles cluster just 5' of the esg message, in the
region that Shigeo Hayashi has found a testis specific esg enhancer.  Also
esg is expressed in precisely the cell types that I see affected.......the
ammunition P was esgP2'  (P2 is the name that Hayashi et al. 1993 Dev
 118:105-115  gave to an insertion from Bier et al. 1989 Genes Dev. 3
1273-1287)
John