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 color change alexandrite gem was faceted from natural alexandrite rough mined in Brazil. Price: $540.00. This genuine alexandrite gemstone has a fairly good color change from rich green in daylight (see upper photo) to reddish-purple hues under incandescent light (see lower photo).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).