41. The sequence of the intron is well conserved only around the splice sites. 42. The 5 splice site on the end of the intron is cut first. 43. Sales of the cancer drug Intron A rose 13 percent to $ 159 million. 44. Scientists aren't sure what introns do. 45. Transposon insertions can also result in intron creation. 46. Intronization is the process by which mutations create novel introns from formerly exonic sequence. 47. It exists in the human genome as an intron and was activated through reconstruction. 48. It was later realized that almost all genes of eukaryotes have introns as well. 49. Exons and introns are not drawn to scale. 50. Although panmictic, the molecular phylogenetics using nuclear introns revealed staggering diversification of population.
