this observation suggests that : 1 ) either cells that synthesize large quantities of the secretory form of delta-chain , unlike cells that synthesize large quantities of the secretory forms of gamma- , epsilon- , or alpha-chains , do this without deleting c mu , or , despite the absence of a typical dna switch sequence between c mu and c delta , controls must exist to effect the c mu deletion and vdj-c delta joining ;
C0007634
cells
C1327616
secretory