Task: Named Entity Recognition
Input (English):  When the W474C - containing alpha - subunit was transiently co - expressed with the beta - subunit to produce Hex A ( alphabeta ) in COS - 7 cells , the mature alpha - subunit was present , but its level was much lower than that from normal alpha - subunit transfections , although higher than in those cells transfected with an alpha - subunit associated with infantile TSD .
Output (English): TSD