Table 5.
An overview of the proportion of Sl80A in present and previous studies. Mean %L cones for all, and grouped by Sl80A, are presented for studies that have reported L:M cone ratios. N/A = not available.
| All | Serine at L opsin position 180 | Alanine at L opsin position 180 | Mean (SD) % L cones | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Ethnicity | Study | n | n | % | n | % | All | Serine180 | Alanine180 |
| Caucasian Norwegian colour normal males | Present study for males whom we have measured %L | 60 | 27 | 45.0 | 33 | 55.0 | 79.8 (11.8) | 77.3 (12.2) | 81.9 (11.2) |
| Caucasian American colour normal males | Carroll et al. (2002) & Hofer et al. (2005) | 62 | 35 | 56.5 | 27 | 43.5 | 73.1 (11.1) | 75.4 (10.8) | 70.2 (11.0) |
| Caucasian colour normal males | Winderickx et al. (1993) | 75 | 46 | 62.2 | 28 | 37.8 | N/A | N/A | N/A |
| African and African American colour normal males | McMahon et al. (2008) | 27 | 26* | 96.3* | 1* | 3.7* | 65.1 (10.7) | 64.4 (10.2) | 84.5 |
| Japanese males | Deeb et al. (1995) | 49 | 41 | 83.7 | 8 | 16.3 | N/A | N/A | N/A |
| Japanese colour normal males | Hayashi et al. (2001) | 119 | 94 | 79.0 | 25 | 21.0 | N/A | N/A | N/A |
*
Frequency are based on L λmax (559 nm for serine and 555.5 nm for alanine).