Double immunofluorescence labeling of 3-day-old germinating castor bean
endosperm. (a, e, i, and
n) Phase contrast. Sections were first incubated with
α-BiP (Hsp70), α-PDI, α-KDEL (MAC256), or α-mMDH
(b, f, k, and
o; green color), with α-CysEP as the second antibody
(c, g, l, and
p; red). The merged images (d,
h, m, and q) are
yellow for BiP, PDI, and KDEL because of colocalization with CysEP,
whereas for CysEP and mMDH the red and green dots are separated because
of localization in different organelles.