the set of expansion segments of a 26s/28s gene is coevolving as a unit in each species , at the same time as the family of 28s rrna genes , as a whole , is undergoing continual homogenization , making all sets of expansion segments from all ribosomal dna ( rdna ) arrays in a species similar in sequence .
C0035705
28s rrna
C0035553
ribosomal