To refer to an mRNA or cDNA gene product, use the gene symbol followed by the type of gene product:

HTT mRNA     CREBBP cDNA

The HUGO Gene Nomenclature Committee recommends that the protein symbol is the same as the gene symbol, but without italics:

CREBBP [gene symbol]     CREBBPP [protein symbol]

For mice and rat proteins, designations follow the same rules as gene symbols, but protein symbols use all capital letters and are not italicised:

TLR2 [protein symbol for toll-like receptor 2 (gene symbol Tlr2)]