The core promoter region is located most proximally and contains the RNA polymerase binding site, TATA box, and transcription start site (TSS). RNA polymerase will bind to this core promoter region stably and transcription of the template strand can initiate. The TATA box is a DNA sequence (5'-TATAAA-3) within the core promoter region where general transcription factor proteins and histones can bind.
The color palette of diamond is very richly varied; it ranges from pink through red, blue, green, yellow and brown even to black diamonds. The rarest color occurring in natural diamonds is red, followed by green, blue, purple and brown.
This genuine alexandrite gemstone has a very strong color change from deep green in daylight to deep red-violet under incandescent light (100%. colors-this genuine alexandrite gemstone is unheated and untreated).his fine quality natural alexandrite gemstone has a very strong natural color change from bluish green in daylight (see lower portion of photo at left) to a beautiful purple-red color under incandescent light as shown in the upper part of the photo at left (it is 100%. color-unheated and untreated).