博凌科为解答：beta actin is a type of cell skel块完迫断厂交困现eton ***.its gene is a h来自ouse keeping 每强话死***.in most of cells，beta actin，such as huma穿花形n skeleton，is expressed in a certain ***.that is the reason that people use beta-actin as the criteria of cell ***.b裂照子明扬果的督叶某ut numerious experiments d充包单emonstrated that beta-actin expression is not constant 质会季商部as its previously described，such as under the circumistance of cell starvation and growth signal stimulation生轻斯粒市联向守在氧极，beta-actin expressi深候万得缩政照们训到on is either upregulated or ***.ther环相议快语诗住神做控已efore，if you use beta-actin as internal control in Western Blot，you ha放布选模船ve to think about these circumistance，as tho花鲜夜妈ugh beta-actin is the most popular protein sign to be as internal control.
