Mating pheromone-induced alteration of the cell surface proteins of haploid cells, presumed to play crucial roles in the specific cell-cell interactions during sexual conjugation of Tremella mesenterica , was investigated. Exposed surface proteins were revealed by lactoperoxidase-catalyzed iodination in combination with polyacrylamide gel electrophoresis and autoradiography. From comparison of ...

Thymidine autoradiography and retrograde transport of horseradish peroxidase (HRP) were combined to determine the connectivity of neurons born in adult canary forebrain. Adult male and female canaries were pretreated with [3H]thymidine to label cells undergoing DNA synthesis prior to mitosis. Thirty or 60 days later, neurons in a forebrain nucleus, hyperstriatium ventralis, pars caudalis (HVc),...

This investigation primarily consisted of labeling cells in forelimbs of the newt; irradiating the labeled limb; and then inducing regeneration with a non-irradiated skin graft. The labeled cells were obtained by injecting tritiated thymidine intraperitoneally into newts with regenerating right forelimbs. The cells in the regenerate which were undergoing DNA synthesis were labeled, and those wh...

A clone of natural killer (NK) cells (JTB18) was found to be ultrastructurally similar to peripheral blood large granular lymphocytes (LGL). These cells incorporated [35S]sulfate into cell-associated proteoglycan molecules, which were then isolated by CsCl density gradient centrifugation. As assessed by gel filtration chromatography, the native 35S-labeled proteoglycan and its beta-eliminated 3...

Apoptotic cells were histochemically demonstrated by the TdT-mediated biotinylated dUTP nick end-labeling (TUNEL) method in formalin-fixed and paraffin-embedded sections of the human endometrium and placental villi. In 53 endometrial biopsy specimens, labeled nuclei were identified in 16 samples showing a desquamating change, associated with menstruation, functional bleeding or adenocarcinoma. ...