Figure 2. O-propargyl-puromycin (OPP) labels nuclei in the distal germline of C. elegans in the presence or absence of emetine.

(A) Representative photomicrographs of germlines labeled for 5 min with 20 µM OPP, and pre-treated for 15 min with control buffer (top row), 45 µM emetine (second row), or 37 µM anisomycin (bottom row). DAPI labels chromosomes. Post-fixation, click labeling of OPP with Alexa Fluor 488 picolyl azide revealed OPP throughout the cytoplasm and concentrated in nuclei. Scale bar = 10 µm. (B) Quantification of OPP-Alexa 488 signal in distal germlines. Each dot represents the average fluorescence of the mitotic zone of one worm germline. Values are normalized to the average obtained for germlines pre-treated with control buffer (OPP alone). P values were obtained through an unpaired t-test. Experiment performed in duplicate.