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The copper-accumulating region of the midgut is a mosaic of interstitial and cup-shaped, copper-accumulating cells. The cup of each cuprophilic cell is lined with a highly refractile border of long microvilli except in one strain where it is predominantly lamellar. The nucleus lies basally; the basal plasma membrane is fairly extensively infolded.(More)
HE infectious nature of the maternally transmitted “sex-ratio’’ condition, TSR , in Drosophila willistoni has been clearly established ( MALOGOLOWKIN and POULSON 1957; MALOGOLOWKIN, POULSON and WRIGHT 1959) and it has been demonstrated that the infectious SR agent is present at high levels in the hemolymph of adult SR females of that species (SAKAGUCHI and(More)