Expression of Frizzled genes in human B cell lines. RNA was derived from human pre-B cells carrying the t(1;19) translocation (697, KOPN-36, KOPN-63), pro-B cells (UOCB-1), pre-B cells (Nalm-6, Reh), mature B cells (Namalwa and Ramos), and a T lineage cell (Jurkat). Yeast tRNA is included as a control. RNA was analyzed by RNase protection by using antisense transcripts of FZ-2, FZ-3, FZ-5, and FZ-6 as probes. P, labeled probe; PF, protected fragment.