Salvageability ranking of validated orphans. The suitability of validated orphans for eventual cloning of at least one cognate gene was evaluated according to the ranking system described in the text. Out of 228 orphans, 57 were judged to be salvageable. A: Overall salvageability ranking (percentage out of 57); B: Domain distribution of salvageable orphans (number of orphans). Note that the total is greater than 57 because some orphans have different evaluations in the different species in which they have been reported. One orphan is also shared between Eubacteria and Eukaryotes.