In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

Example Input:  The discordant mutants may reflect interactions with a variable domain of a conserved component or unique interactions with specialized components of the basal transcription apparatus in different cells .
Example Output: variable domain

Example Input:  A signaling complex of Ca2 + - calmodulin - dependent protein kinase IV and protein phosphatase 2A [ see comments ]
Example Output: protein phosphatase 2A

Example Input:  To explain the end - organ resistance to cortisol , the glucocorticoid receptors ( GR ) in peripheral mononuclear leukocytes and cultured skin fibroblasts from a forearm skin biopsy were characterized and compared with the results of similar studies in normal subjects .
Example Output:
glucocorticoid receptors