RPL44 and RPL44', encoding acidic ribosomal phosphoproteins YP2 alpha(L44) and YP1 beta(L44'), are adjacent to rig and STF1 on Saccharomyces cerevisiae chromosomes XV and IV respectively.

The RPL44' gene from Saccharomyces cerevisiae encoding the ribosomal protein YP1 beta(L44') has been found to be linked to the STF1 gene, encoding a stabilizing factor of the F1F0-ATPase inhibitor protein from mitochondria. Evidence of this linkage comes from results obtained from Northern hybridization using a DNA probe that contains a complementary region to the 5' end of the mRNA of RPL44'. Similarly, a data bank search has shown that RPL44, encoding ribosomal protein YP2 alpha (L44) is linked to the rig gene that encodes ribosomal protein S21.