larvae carrying the combination of two viable mutants , mus-105 ( a1 ) mus-109 ( d1 ) , die at the larva-pupa boundary and display a high frequency of aberrations ( 0.7 per cell vs. 0.075 for either mutant alone ) clustered at euchromatin-heterochromatin junctions .
C0007634
cell
C0059882
euchromatin