Poly A Containing RNA in Rabbit Embryos

While the significance of these poly (A) sequences in mRNA is still unclear, the sequences can be considered as useful markers for detecting putative mRNA synthesis. As a result, heterogeneous RNA synthesized in rabbit embryos has been assayed for the presence of poly (A) containing RNA in an effort to provide evidence for, and an estimate of. 

Experiments designed to test whether polysomes containing this RNA 

Amount of Nuclear and Polysomal Heterogeneous RNA Associated WITH Poly(A) Sequences in the Preimplantation Rabbit Embryo 

Monesi et al. (1970) suggested that both newly synthesized mRNA and mRNA of maternal origin are utilized during cleavage although it has also been suggested that maternal mRNA s may be utilized exclusively (Chapman et al., 1971). The assay of poly (A) sequences as markers for monitoring mRNA synthesis will very likely be a useful tool in the clarification of this problem in the future. 

The isolation of poly (A) containing RNA s may also be useful in the identification of those RNA sequences within the HnRNA pool destined to become presumptive messenger RNA. In Section IV it will be shown that 1.8% of the unique DNA base sequences are transcribed in the rabbit blastocyst (Schultz et al., 1973b). This is equivalent to 

---