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Common schemes for the maintenance/propagation of sterile mutations in C. elegans. (A) Wild type strain propagation. (B) Sterility mutant propagation. (C) Conditional sterility mutant propagation. (D) Sibling Selection for non-conditional sterility mutants. (E) Marked strain selection. (F) Chromosomally balanced strains. (G) Transgene/free duplication-balanced strains. See text for details.
