780
We report here that the second alteration, at threonine 78 , also plays an important, although more indirect, role: alteration of the sequence at threonine 78 such that it resembles that of c-erb A can act as an intragenic suppressor and can partially restore function to a v-erb A protein rendered defective due to a mutation at position 61 .
 protein: c-erb A; protein: v-erb A protein; protein: position 61; protein: v-erb A
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: c-erb A; protein: v-erb A protein; protein: position 61; protein: v-erb A