Task: Named Entity Recognition
Input (English):  The B - cell - type specificity of the immunoglobulin ( Ig ) heavy - chain and light - chain promoters is mediated by an octanucleotide ( OCTA ) element , ATGCAAAT , that is also a functional component of other RNA polymerase II promoters , such as snRNA and histone H2B promoters .
Output (English): RNA polymerase II