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Fig. 1. Insertion of secretory gene trap vectors into Lama1 and
Lamb1. (A) The vector pGT0TMp inserted into the third and largest
intron of Lama1, which is 20.4 kb. The remaining 59 downstream exons
and introns are not shown. (B) The vector pGT1TMpfs inserted into the 23rd and
largest intron of Lamb1, which is 10.2 kb. The remaining exons (of
the 33 total) and introns are not shown.