Alignment of the mouse and human p27Kip1 gene sequences. Bold arrows indicate the major transcription start sites. Minor start sites detected by RLM-RACE are indicated with small arrows. The genes are numbered with the major transcription start site as +1. A colon between the human and mouse sequences indicates identical nucleotides. Gaps in the alignment are indicated by dashes. ATG translation start codons are boxed. The sequence alignment was performed using the ALIGN program at the Biology WorkBench web site.