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Maps of the six macronuclear genes found in P. tetraurelia stock 51. Since each gene contained only one XbaI site, this site was used to clone into the vector, pTZ18 (2.9 kb) or pUC18 (2.7 kb). Note that all differences are found in the spacer region (single line). Numbers to the right of each map indicate the numbers of clones in which the genes were found. The black bar represents DNA coding for 17S RNA, and the crosshatched bar represents DNA coding for 25S RNA. H, HindIII; R, EcoRI.
