Table 6.

Quantitative analysis of the coexistence between P2Y₁ and P2Y₄ receptors in the rat anterior pituitary (positive cell number/0.36 mm²)

	P2Y+1		P2Y1−
	Number	%	Number	%
P2Y+4	42 ± 12	93 (p1)	4 ± 2	91 (p3)
P2Y4−	3 ± 1	7 (p2)	NA	NA

P2Y⁺₁P2Y⁺₄, P2Y₁ receptor-ir cells also expressing P2Y₄ receptors; P2Y₁⁺P2Y₄⁻, P2Y₁ receptor-ir cells not expressing P2Y₄⁻; P2Y₁⁻P2Y₄⁺, P2Y₄-ir cells not expressing P2Y₁ receptors; P2Y₁⁻ P2Y₄⁻, cells expressing neither P2Y₁ nor P2Y₄ receptors; NA, not assayed; p1 = number of P2Y⁺₁P2Y⁺₄/total number of P2Y⁺₁ cells × 100; p2 = number of P2Y⁺₁P2Y₄⁻/total number of P2Y⁺₁ cells × 100; p3 = number of P2Y₁⁻P2Y⁺₄/total number of P2Y⁺₄ cells × 100