Analysis of transcriptional initiation sites of the Gipi3k1 gene. 5' RACE analysis, performed as described in the Methods section, suggests the presence of multiple transcription initiation sites for the Gipi3k1 gene. Sequence motifs common in G. intestinalis promoters are in italics and bold. Putative start codons are in bold and underlined. Predicted sizes of three Gipi3k1 mRNA transcripts are shown.