Table 3. Number of muscular pulmonary arterioles in each group.

Day	C	M	PGE1
7	2.2±0.1	2.3±0.1	2.2±0.4
14	2.2±0.1	2.9±0.1	2.6±0.1
21	2.3±0.2	3.8±0.2*	3.1±0.2#
28	2.4±0.2	5.5±0.5*	4.2±0.4#

C, control; M, monocrotaline; PGE1, prostaglandin E1. ^*P<0.05 vs. the corresponding value in the C group, ^#P<0.05 vs. the corresponding value in the M group.