Fig. 4From: Divergent evolutionary behavior of H3 histone gene and rDNA clusters in venerid clams5S rDNA clusters on Petricola litophaga. FISH of H3 histone gene (H3), 5S (5S) and 28S (28S) rDNA probes to prophase I meiotic bivalents of Petricola litophaga (PLI) clearly show the presence of two distinct 5S rDNA signals (arrows) on a single bivalent. Scale bars, 5 μmBack to article page