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. 2004 May;135(1):334–345. doi: 10.1104/pp.103.036459

Figure 1.

Figure 1.

In vivo APase staining of pup3 roots under −P conditions. When cleaved by APases, the substrate BCIP forms a blue precipitate on the root surface. The pup3 mutant was identified by reduced in vivo APase staining of 5-dpg seedlings when grown with minimal Pi.