At the n - terminal end is the variable domain of 26 amino acids in length , which has no conserved mgxxc ( s / q ) xxt sequence essential for n - myristoylation . so it is conferred that the vfcpkl is a soluble protein N端的可变区有26个氨基酸残基,没有豆蔻酰化所必需的保守序列mgxxc ( s q ) xxt ,因此推测vfcpk1可能是水溶性蛋白。