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a and b, Whole mount smooth muscle actin (SMA) immunostaining (black) to label artery trees in guinea pig and mouse postnatal brains and adult hearts, visualized by light-sheet imaging. a, Artery trees in guinea pig and mouse postnatal brains show pial collateral arteries connecting anterior cerebral artery (ACA) and middle cerebral artery (MCA) branches. Insets show higher magnification views; arrowheads indicate representative pial collaterals. Scale bars, 2 mm. b, Adult guinea pig hearts possess numerous collateral arteries (arrowheads) connecting the left (LCA) and right (RCA) coronary artery branches. In contrast, mice have none. Insets show higher magnification views. Scale bars, 1 mm. c and d, Developmental time course of guinea pig hearts spanning gestational days (GD) 25-38 with whole mount SMA immunostaining (white) to label artery trees and collaterals (arrowheads and purple trace). Scale bars, 250 μm. e, Quantification using semi-automated tracing (purple in d ) showed that coronary collaterals were first evident around GD32 and became progressively more abundant over time (GD25, n=2; GD32, n=2; GD35, n=3).

Journal: bioRxiv

Article Title: A Perturb-seq screen guided by species divergence uncovers pathways for collateral artery formation

doi: 10.64898/2026.04.29.721711

Figure Lengend Snippet: a and b, Whole mount smooth muscle actin (SMA) immunostaining (black) to label artery trees in guinea pig and mouse postnatal brains and adult hearts, visualized by light-sheet imaging. a, Artery trees in guinea pig and mouse postnatal brains show pial collateral arteries connecting anterior cerebral artery (ACA) and middle cerebral artery (MCA) branches. Insets show higher magnification views; arrowheads indicate representative pial collaterals. Scale bars, 2 mm. b, Adult guinea pig hearts possess numerous collateral arteries (arrowheads) connecting the left (LCA) and right (RCA) coronary artery branches. In contrast, mice have none. Insets show higher magnification views. Scale bars, 1 mm. c and d, Developmental time course of guinea pig hearts spanning gestational days (GD) 25-38 with whole mount SMA immunostaining (white) to label artery trees and collaterals (arrowheads and purple trace). Scale bars, 250 μm. e, Quantification using semi-automated tracing (purple in d ) showed that coronary collaterals were first evident around GD32 and became progressively more abundant over time (GD25, n=2; GD32, n=2; GD35, n=3).

Article Snippet: Guinea pig gestational stages were assigned from Charles River timed-breeding records, with embryo length and gross heart size recorded at dissection as secondary morphometric support.

Techniques: Immunostaining, Imaging