The document lists various components and classifications related to the gastro-intestinal system. It includes multiple codes and identifiers associated with different aspects of this biological system. The content appears to be a structured categorization rather than a narrative or descriptive text.

1. GASTRO-INTESTINAL
SYSTEM

2. E 1

3. E 1

4. E 2

5. E 3

6. E-3a

8. G 4

10. G 3

12. G 5

13. G-comp

14. G1

16. S 1

17. S 2

18. S-comp

19. S-comp

20. M 3

21. M4

23. C 2

25. C 5

26. C 6

27. C 3

29. C 1

30. C 4

31. C 8

33. IS 1

34. is2

37. IS 3

39. IF 4

40. IF1

42. IF 3

44. IN 1

46. IN 2

47. IN P3

48. PC 4- pc4

49. IN 5

50. IN 6

52. IN7

53. IN 8

55. MI 4

56. MI2

57. MI P3