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These results suggest that haemoglobin production in UT-7 cells is limited by a deficiency of erythroid-specific aminolaevulinic acid synthase ( ALAS-E ) activity or globin synthesis as a consequence of their immaturity as a multipotential cell line .
 ALAS-E, UT-7 cells, multipotential cell line, erythroid-specific aminolaevulinic acid synthase, erythroid-specific aminolaevulinic acid synthase ( ALAS-E ) activity
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 ALAS-E, UT-7 cells, multipotential cell line, erythroid-specific aminolaevulinic acid synthase, erythroid-specific aminolaevulinic acid synthase ( ALAS-E ) activity