Fig. 1. FGFR4 and deletion mutants. The extracellular part of FGFR4 is indicated in gray and the intracellular part in white. Numbers refer to amino acid positions and stippled lines indicate the part of the receptor that has been deleted. GFP, green fluorescent protein; SP, signal peptide; TM, transmembrane region. Arrows and `K' indicate the position of the tyrosine kinase domain.