passages.id: split_5_test_2753_passage
passages.type: progene_text
passages.text: The thermal stability of the murine MHC class II molecule , I-A ( b ) , in complex with invariant chain - derived peptide ( CLIP ) and an antigenic peptide derived from the alpha subunit of the I - E molecule ( Ealpha ) at mildly acidic and neutral pH were analyzed using circular dichroism ( CD ) .