Repetitive during differentiation

Is intermediate DNA transcribed The majority of experiments that demonstrate DNA/RNA homology have been done under conditions that will only allow repeated sequences to hybridize. Many studies indicate that RNA sequences are transcribed from repetitive DNA both during development (Denis, 1966 GliSin et al., 1966 Whiteley et al., 1966 Church and McCarthy, 1967a, b Davidson et al., 1968 Hennig, 1968) and in differentiated adult cells (McCarthy and Hoyer, 1964 Paul and Gilmour, 1968). However, many of these RNA sequences are retained in the nucleus (Shearer and McCarthy, 1967 McCarthy et al., 1969), so their functional role is uncertain. We will return to this point in a later section. 

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