union and central pacific railroads met at promontory, utah.
union and central pacific railroads met at promontory, utah.
where did union and central pacific railroads meet?
promontory , utah
by the summer of 1868, the central pacific (cp) had completed the first rail route through the sierra nevada mountains, and was now moving down towards the interior plains and the union pacific (up) line. more than 4,000 workers, of whom two thirds were chinese, had laid more than of track at altitudes above . in may 1869, the railheads of the union pacific and the central pacific railroads finally met at promontory summit, utah territory. a specially-chosen chinese and irish crew had taken only 12 hours to lay the final of track in time for the ceremony.









































section::::golden spike.
promontory, utah
grb2 associated binding protein 3









































grb2 associated binding protein 3 is a protein that in humans is encoded by the gab3 gene.









































section::::function.









































this gene is a member of the grb2-associated binding protein gene family. these proteins are scaffolding/docking proteins that are involved in several growth factor and cytokine signaling pathways, and they contain a pleckstrin homology domain, and bind shp2 tyrosine phosphatase and grb2 adapter protein. the protein encoded by this gene facilitates macrophage differentiation. alternative splicing results in multiple transcript variants.
grb2 associated binding protein 3