There is provided a semiconductor light-emitting element and a method of producing the same including high density and high quality quantum dots emitting light at a wavelength of 1. The improved injector can distribute heated precursor gases into a growth chamber in flows that spatially separated from each other up until they impinge of a growth substrate and that have volumes adequate for high volume manufacture. Both the antibodies and the peptides are important for the treatment of human heart failure and other contractile disorders. Therefore, the number of the cans is less than the number of spinning positions, and the height of the cans is selected so that an operator can easily handle the sliver in the can.