A, the assay was calibrated with empty vectors of the two-hybrid system and with kit controls (pACT-MyoD and pBIND-Id). B, results of the PrLZ isoforms in pACT co-transfected with each 14-3-3 cDNA in pBIND. TPD52, the prototype of the TPD52 family, was included in the study. Similar results were obtained in a complementary experiment, when PrLZ isoforms in pBIND was examined for interaction with 14-3-3 in pACT (data not shown). When transfected individually, neither the PrLZ nor 14-3-3 constructs induced significant luciferase activity from the pG5-luc reporter (data not shown). Each data represent the mean of triplicate assays. Standard deviation was less than 5% of the mean and is not shown.