HSPA1A and measles: The stress-inducible 70 kDa heat shock protein 70 (Hsp72, also known as Hsp70 and HSPA1A), previously shown to enhance measles virus transcription [41, 42] and determine measles neurovirulence in mice [43], was readily detectable by immunoblotting in lysates prepared from cells heat shocked at 43°C for 4 h (Fig. 3C).