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Table 2 Direct repeats found near intron/exon boundaries. The first six rows correspond to the first 5' intron, the next five rows to the second 5' intron, and the last three to the 3' intron.

From: Intron Evolution and Information processing in the DNA polymerase α gene in spirotrichous ciliates: A hypothesis for interconversion between DNA and RNA deletion

Species

Intron

Intron length (bp)

5' repeat

3' repeat

XL?

Location (MDS no.)

Freq.§

Holosticha

1

49

CAG < gta

cag < GTA

Yes

8

2

Uroleptus

1

79

TAG < gtt

tag < GTT

Yes

1

2

Sterkiella

1

76

TAG < gt

tag < GT

Yes

1

3

Paraurostyla

1

43

A < g

ag <

No

1–2

1936

Stylonychia

1

49

A < g

ag <

No

1

1871

Eschaneustyla

1

73

A < g

ag <

No

ND

1940

Holosticha

2

32

T < gta

tgta g <

No

8–9

15

Uroleptus

2

34

< gta

ta g <

No

2

2178

Paraurostyla

2

26

TAG AT <

tag <

No

3

412

Stylonychia

2

71

AT <

at ag <

No

2

2325

Sterkiella

2

53

AT <

at ag <

No

2

2174

Urostyla I/II

1

192

< gtaaggcttatta

g< CTTATTA

Yes

41/41–42

2

Uroleptus

3

33

G < gtaa

g < GTAA

Yes

34

10

Eschaneustyla

2

193

AG < g

ag < G

Yes

ND

245

  1. Symbolism: EXON < intron or intron < EXON. Repeats may be underlined for clarity.
  2. XL?: translationally frame-preserving after excision as an IES
  3. § Freq: frequency (%) of repeat word in entire MAC sequence