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.
Since natural citrine is rare, most of the citrine on the market is the result of heat treatment, which causes some amethyst to change color from undesirable pale violet to an attractive yellow. The amethystâs original hue can determine the richness of the resulting citrineâs yellow color.itrine Description. Citrine is one of the most popular yellow gems on the market. This designer cut shows off the warm glow of citrineâs sunny color. â Lydia Dyer, gem courtesy John Dyer & Co. Citrineâthe transparent, pale yellow to brownish orange variety of quartzâis rare in nature.