Tyrosine hydroxylase, the rate limiting enzyme in the biosynthesis of catecholamine, is a tetramer composed of four subunits of the same molecular mass. A full length cDNA clone encoding tyrosine hydroxylase has been inserted into the SP6 expression system. Translation of the corresponding RNA in Xenopus oocyte results in enzymatic activity, demonstrating that a single gene contains all the nec...

We study some geometry of the exceptional group G2(q), q even, in terms of symplectic geometric configurations in the projective space PG(5, q). Using the spin representation of Sp6(q), we obtain an alternative description of the Split Cayley hexagon H(q) related to G2(q). We also give another geometric proof of the maximality of G2(q), q even, in PSp6(q).