Parameters : | mode : { 1, 2, 3, 4, 5 }
Indicate which of the four possible PID scores described in Raghava2006
should be calculated, the fifth possibility is added for linguistic
purposes:
- identical positions / (aligned positions + internal gap positions),
- identical positions / aligned positions,
- identical positions / shortest sequence, or
- identical positions / shortest sequence (including internal gap
pos.)
- identical positions / (aligned positions + 2 * number of gaps)
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