31. The CCL2 gene has three exons and two introns . 32. The external intron was interrupted by an internal intron containing two additional introns. 33. The external intron was interrupted by an internal intron containing two additional introns. 34. The external intron was interrupted by an internal intron containing two additional introns . 35. A 3D representation of the Group I catalytic intron . 36. This RNA is expressed from an intron of the MNAB / OR1K1 gene. 37. One splice variant includes introns 1 and 6 but no protein is formed. 38. The ARF3 gene contains five exons and four introns . 39. The ARF4 gene spans approximately 12kb and contains six exons and five introns . 40. The position of the introns are conserved, indicating that they are ancient.
