Addition of the fourth nucleotide on the Nascent Transcript: Second Transition (Xenopus tropicalis)
addition of the fourth nucleotide on the nascent transcript: second transition (xenopus tropicalis)
Addition of the fourth nucleotide on the Nascent Transcript: Second Transition (Xenopus tropicalis)
addition of the fourth nucleotide on the nascent transcript: second transition (xenopus tropicalis)