Extended Data Fig. 5: The frequency distribution and Gaussian fitting of the length-to-width ratio of the melanosomes in the lateral and pineal eyes of Haikouichthys ercaicunensis.
From: Four camera-type eyes in the earliest vertebrates from the Cambrian Period
a, pineal eyes (n = 250). b, lateral eyes (n = 549). n refers to the measured number of melanosome microbodies. xc: peak centre value; R2: regression coefficient.
