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The Arabidopsis thaliana PHS1 homolog. (A) The AtPHS1 gene. Blue triangle = position of the Ds insertion in the Atphs1–1 mutant. (B) Paring of 5S rRNA loci in a wild-type and Atphs1–1 mutant meiocytes. Only one 5S locus associated with a nonhomologous chromosome segment is shown in the mutant. Closeups are shown in insets. Images are flat projection of several consecutive optical sections but do not represent entire nuclei. (Scale bar, 5 μm.)
