[Re-analysis of DNA sequence data from a dinosaur egg fossil unearthed in Xixia of Henan Province].

To identify the real source of two putative dinosaur 18S rDNA sequences of DA18S1 and DA18S7 cloned from a dinosaur egg fossil unearthed in Xixia of Henan Province, China, sequence homology searching was performed on the INTERNET by programs of the BLAST server and FASTA server. Neither of the two sequences was found to be similar with prokaryotic sequences. The base identity between DA18S7 with several plant 18S rDNA sequences is among 89.0-92.4%, much higher than that with 18S rDNAs of other organisms. DA18S1 has larger similarities with fungal, invertebrate and plant 18S rDNAs than with the vertebrate sequences. Molecular phylogeny analysis of DA18S1 indicated that DA18S1 clusters with fungal 18S rDNAs. These results show that DA18S1 and DA18S7 are of fungal and plant origin, respectively.