Table 1.

Biased migration of melanocytes. Embryos were stained with the melanocyte marker Trp2 using in situ hybridization to identify pigment cells. The pigment spots on both the left and the right side of each embryo were counted. Student's t-test analysis of the raw data shows a significantly higher (P = 0.002) melanocyte migration on the left side of the embryos.

Embryo	Left	Right
1	25	16
2	10	9
3	18	27
4	11	13
5	7	4
6	15	17
7	29	24
8	19	13
9	15	10
10	1	2
11	27	18
12	10	6
13	8	3
14	7	3
15	45	25
16	7	4
17	11	10
18	9	14
19	7	5
20	10	4
21	6	4
22	12	7
23	6	7
24	16	8
25	15	5
26	7	5
27	10	7
28	7	4
Average	13.21	9.78
Stddev	9.11	7.08
t-test (paired)	0.002088
Embryos with more melanocytes	22 (78%)	6 (22%)